CN110988772A - Check-up comparison circuit of ultraviolet imager - Google Patents
Check-up comparison circuit of ultraviolet imager Download PDFInfo
- Publication number
- CN110988772A CN110988772A CN201911319942.5A CN201911319942A CN110988772A CN 110988772 A CN110988772 A CN 110988772A CN 201911319942 A CN201911319942 A CN 201911319942A CN 110988772 A CN110988772 A CN 110988772A
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- voltage
- ultraviolet imager
- power supply
- partial discharge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
-
- G—PHYSICS
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
Abstract
The invention discloses a verification comparison circuit of an ultraviolet imager, which solves the problem of how to effectively verify and compare the ultraviolet imager. The 380V power supply system (1) is connected with the input end of a variable frequency power supply (3) through a high-voltage cable (2), the output end of an exciting transformer (4) is connected with the low-voltage end of an electric reactor (5) through a voltage adding line (6), the high-voltage end of the electric reactor (5) is connected with the high-voltage end of a voltage divider (11) through a non-corona lead (8), and the high-voltage tail end of the exciting transformer (4) without partial discharge, the ground end of the voltage divider (11) and the ground end of a detection impedance (12) are connected with a ground end (10) through a ground shielding line (9); a tiny crevasse burr point (15) is arranged on the non-corona lead (8), and the other end of the coaxial cable (13) is connected with the input end of a partial discharge tester (14). The network access detection work of the ultraviolet imager of the charged detector is realized.
Description
Technical Field
The invention relates to a checking and comparing circuit of charged equipment, in particular to a circuit and a checking and comparing method for checking and comparing an ultraviolet imager for detecting a corona phenomenon generated by partial discharge of the charged equipment in real time.
Background
The ultraviolet imager is one of main equipment for detecting the electrification of the power grid equipment, and is generally used for detecting the corona phenomenon generated by the partial discharge of the electrification equipment in real time so as to remind operation and maintenance personnel of carrying out state maintenance on the electrification equipment in time; the ultraviolet imager is expensive, and the product quality is uneven; at present, a power grid operation department does not have a calibration means for an ultraviolet imager, effective calibration comparison and installation can not be carried out on detection performance of the ultraviolet imager, and a circuit capable of comparing the ultraviolet imager and a detection comparison method are urgently needed to be developed on site to guide network access detection work, so that the performance of the ultraviolet imager entering the power grid operation department is guaranteed, and the accuracy efficiency of operation and maintenance personnel for finding equipment faults through the ultraviolet imager is improved.
Disclosure of Invention
The invention provides a verification comparison circuit of an ultraviolet imager, which solves the technical problem of how to effectively verify and compare the ultraviolet imager.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: a checking and comparing test loop is set up, weak partial discharge is generated through the checking and comparing test loop, and therefore the corona phenomenon which cannot be identified through visual inspection is caused; through setting up a verification comparison test loop, the data of the ultraviolet imager monitoring discharge particle number, the partial discharge capacity and the initial discharge voltage correlation are formed, and the ultraviolet imager linearity and detection voltage sensitivity check indexes are defined, so that the ultraviolet imager effectiveness is compared and verified, and the network access detection work is effectively carried out.
A check comparison circuit of an ultraviolet imager comprises a 380-volt power supply system, a variable frequency power supply for changing a three-phase power supply into a single-phase power supply with adjustable frequency, an excitation transformer without partial discharge, a reactor, a corona-free wire, a coupling capacitor, a detection impedor, a voltage divider, a partial discharge tester and an ultraviolet imager, wherein the 380-volt power supply system is connected with the input end of the variable frequency power supply through a high-voltage cable; the corona-free lead is provided with a micro crevasse burr point, an ultraviolet imager is arranged right above the micro crevasse burr point, a coaxial cable is connected to the signal output end for detecting impedance, and the other end of the coaxial cable is connected with the input end of the partial discharge tester.
The micro-crevasse burr points are square holes of 1 cm x 1 cm.
A verification comparison method of an ultraviolet imager is carried out in a laboratory, the laboratory is required to be in a fully sealed state, the temperature and the humidity of a detection environment are constant, the temperature and the humidity of the environment of the laboratory are detected for multiple times, and when the detected data are kept unchanged, the following steps are carried out:
the method comprises the following steps that firstly, a 380V power supply system is connected with a variable frequency power supply through a high-voltage cable, the variable frequency power supply is connected with an excitation transformer without partial discharge, the variable frequency power supply is a variable frequency power supply which changes a three-phase power supply into a single-phase power supply with adjustable frequency, and the excitation transformer without partial discharge changes low-voltage input into high-voltage output;
secondly, connecting the output end of the excitation transformer without partial discharge with the low-voltage end of the reactor by using a pressure wire, wherein the pressure wire adopts a sheath wire with the cross section of 4 square millimeters, the high-voltage end of the reactor is connected with the high-voltage end of the coupling capacitor and the high-voltage end of the voltage divider by a corona-free lead, connecting the tail end of the coupling capacitor with the input end of the detection impedor, and connecting the high-voltage tail end of the excitation transformer without partial discharge, the ground end of the voltage divider and the ground end of the detection impedor with a grounding shielding wire to complete the construction of a verification and comparison test loop; the reactor is connected with the coupling capacitor and the voltage divider to form a resonance amplification circuit, the applied voltage on the non-corona lead is amplified to be Q times of the output voltage of the excitation transformer without partial discharge, and Q is a quality factor of the built comparison test loop of the calibration;
thirdly, connecting the signal output end of the detection impedor with the detection input end of the partial discharge tester by using a coaxial cable;
step four, starting a verification comparison test loop, starting boosting, carrying out on-site observation on the discharge condition of the non-corona wire by using the detected ultraviolet imager when the voltage value displayed by the voltage divider reaches 500 kilovolts, measuring the partial discharge quantity of the non-corona wire by using a partial discharge tester, and if the ultraviolet imager and the partial discharge tester do not find the discharge phenomenon, indicating that the verification comparison test loop is good, and then carrying out the next step;
fifthly, stopping the test of the verification comparison test loop, locally puncturing the non-corona lead to puncture a square crevasse with the size of 1 cm multiplied by 1 cm, and manufacturing a tiny crevasse burr point;
sixthly, starting a verification comparison test loop again, gradually increasing the voltage, starting to record when the ultraviolet imager monitors that no corona wire has discharge particles, wherein the voltage value of the voltage divider, the number of the discharge particles monitored by the ultraviolet imager and the partial discharge quantity monitored by the partial discharge tester are 10 kilovolts per liter, and recording the number of the discharge particles monitored by the ultraviolet imager and the partial discharge quantity monitored by the partial discharge tester at one time until the voltage value of the voltage divider reaches 500 kilovolts;
the seventh step, the discharge particle number monitored by the ultraviolet imager under each voltage value recorded in the sixth step and the discharge value displayed by the partial discharge tester are respectively subjected to linear fitting, and a change curve of the ultraviolet discharge particle number along with the test voltage and a change curve of the partial discharge amount along with the test voltage are established, if the difference between the increase amplitude of the discharge particle number ring ratio monitored by the ultraviolet imager under each test voltage and the increase amplitude of the discharge particle ring ratio monitored by the partial discharge tester under the same test voltage is not more than 30%, the linearity of the ultraviolet imager to be tested is qualified, otherwise, the linearity of the ultraviolet imager to be tested is unqualified;
and step eight, starting the check comparison test loop again, gradually increasing the voltage, observing the tiny crevasse burr points on the non-corona lead by using the ultraviolet imager to be detected, and when the voltage value on the voltage divider reaches 6 kilovolts, if the ultraviolet imager to be detected observes the discharge phenomenon, the detection voltage sensitivity of the ultraviolet imager is qualified, and if the ultraviolet imager to be detected does not observe the discharge phenomenon, the detection voltage sensitivity of the ultraviolet imager is unqualified.
The invention is practical and simple, can carry out detection and comparison aiming at the effectiveness of the ultraviolet imager, realizes the network access detection work of the ultraviolet imager of the electrified detection instrument for the first time, improves the quality level of equipment and stops the network access operation of unqualified products.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a check comparison circuit of an ultraviolet imager comprises a 380-volt power supply system 1, a variable frequency power supply 3 for changing a three-phase power supply into a single-phase power supply with adjustable frequency, an exciting transformer 4 without partial discharge, a reactor 5, a corona-free wire 8, a coupling capacitor 7, a detection impedor 12, a voltage divider 11, a partial discharge tester 14 and an ultraviolet imager 16, wherein the 380-volt power supply system 1 is connected with the input end of the variable frequency power supply 3 through a high-voltage cable 2, the output end of the exciting transformer 4 is connected with the low-voltage end of the reactor 5 through a voltage adding line 6, the coupling capacitor 7 is connected with the detection impedor 12 in series and then connected with the two ends of the voltage divider 11 in parallel, the high-voltage end of the reactor 5 is connected with the high-voltage end of the voltage divider 11 through the corona-free wire 8, the high-voltage tail end of the exciting transformer 4 without, are connected with a grounding end 10 through a grounding shielding wire 9; a micro crevasse burr point 15 is arranged on the non-corona lead 8, an ultraviolet imager 16 is arranged right above the micro crevasse burr point 15, a coaxial cable 13 is connected to the signal output end of the detection impedance 12, and the other end of the coaxial cable 13 is connected with the input end of a partial discharge tester 14.
The micro-crevasse burr points 15 are square holes of 1 cm x 1 cm.
A verification comparison method of an ultraviolet imager is carried out in a laboratory, the laboratory is required to be in a fully sealed state, the temperature and the humidity of a detection environment are constant, the temperature and the humidity of the environment of the laboratory are detected for multiple times, and when the detected data are kept unchanged, the following steps are carried out:
firstly, connecting a 380V power supply system 1 with a variable frequency power supply 3 by using a high-voltage cable 2, connecting the variable frequency power supply 3 with an excitation transformer 4 without partial discharge, wherein the variable frequency power supply 3 is a variable frequency power supply for changing a three-phase power supply into a single-phase power supply with adjustable frequency, and the excitation transformer 4 without partial discharge is used for changing low-voltage input into high-voltage output;
secondly, connecting the output end of the excitation transformer 4 without partial discharge with the low-voltage end of the reactor 5 by using a pressure line 6, wherein the pressure line 6 adopts a sheath wire with the cross section of 4 square millimeters, the high-voltage end of the reactor 5 is connected with the high-voltage end of the coupling capacitor 7 and the high-voltage end of the voltage divider 11 by using a corona-free lead wire 8, connecting the tail end of the coupling capacitor 7 with the input end of the detection impedor 12, and connecting the high-voltage tail end of the excitation transformer 4 without partial discharge, the ground end of the voltage divider 11 and the ground end of the detection impedor 12 together by using a grounding shielding wire 9 and a grounding end 10 to complete the establishment of a verification and comparison test loop; the reactor 5 is connected with the coupling capacitor 7 and the voltage divider 11 to form a resonance amplification circuit, the applied voltage on the non-corona lead 8 is amplified to be Q times of the output voltage of the excitation transformer 4 without partial discharge, and Q is the quality factor of the built comparison test loop of the verification;
thirdly, connecting the signal output end of the detection impedor 12 with the detection input end of the partial discharge tester 14 by using the coaxial cable 13;
step four, starting a verification comparison test loop, starting boosting, carrying out on-site observation on the discharge condition of the non-corona wire 8 by using the detected ultraviolet imager 16 when the voltage value displayed by the voltage divider 11 reaches 500 kilovolts, measuring the local discharge amount of the non-corona wire 8 by using the local discharge tester 14, and if the ultraviolet imager 16 and the local discharge tester 14 do not find a discharge phenomenon, indicating that the verification comparison test loop is good, and then carrying out the next step;
fifthly, stopping the test of the verification comparison test loop, locally puncturing the non-corona lead 8 to puncture a square crevasse with the size of 1 cm multiplied by 1 cm, and manufacturing a tiny crevasse burr point 15;
sixthly, starting a verification comparison test loop again, gradually increasing the voltage, starting recording when the ultraviolet imager 16 monitors that no corona wire 8 has discharge particles, wherein the voltage value of the voltage divider 11, the number of the discharge particles monitored by the ultraviolet imager 16 and the local discharge amount monitored by the local discharge tester 14 are 10 kilovolts per liter, and recording the number of the discharge particles monitored by the ultraviolet imager 16 and the local discharge amount monitored by the local discharge tester 14 once until the voltage value of the voltage divider 11 reaches 500 kilovolts;
seventhly, respectively performing linear fitting on the discharge particle number monitored by the ultraviolet imager 16 under each voltage value recorded in the sixth step and the discharge value displayed by the partial discharge tester 14, and establishing a change curve of the ultraviolet discharge particle number along with the test voltage and a change curve of the partial discharge along with the test voltage, wherein if the difference between the increase amplitude of the discharge particle number ring ratio monitored by the ultraviolet imager 16 under each test voltage and the increase amplitude of the discharge particle ring ratio monitored by the partial discharge tester 14 under the same test voltage is not more than 30%, the linearity of the tested ultraviolet imager 16 is qualified, otherwise, the linearity of the tested ultraviolet imager 16 is unqualified;
and step eight, starting the verification comparison test loop again, gradually increasing the voltage, observing the tiny crevasse burr points 15 on the non-corona lead 8 by using the ultraviolet imager 16 to be tested, and when the voltage value on the voltage divider 11 reaches 6 kilovolts, if the ultraviolet imager 16 to be tested observes the discharge phenomenon, the detection voltage sensitivity of the ultraviolet imager 16 is qualified, and if the ultraviolet imager 16 to be tested does not observe the discharge phenomenon, the detection voltage sensitivity of the ultraviolet imager 16 is unqualified.
Claims (2)
1. A verification comparison circuit of an ultraviolet imager comprises a 380-volt power supply system (1), a variable frequency power supply (3) for changing a three-phase power supply into a single-phase power supply with adjustable frequency, an exciting transformer (4) without partial discharge, a reactor (5), a corona-free wire (8), a coupling capacitor (7), a detection impedor (12), a voltage divider (11), a partial discharge tester (14) and an ultraviolet imager (16), and is characterized in that the 380-volt power supply system (1) is connected with the input end of the variable frequency power supply (3) through a high-voltage cable (2), the output end of the exciting transformer (4) is connected with the low-voltage end of the reactor (5) through a voltage-adding line (6), the coupling capacitor (7) is connected with the detection impedor (12) in parallel at two ends of the voltage divider (11) after being connected in series, the high-voltage end of the reactor (5) is connected with the high-voltage end of the voltage divider, the high-voltage tail end of the excitation transformer (4) without partial discharge, the ground end of the voltage divider (11) and the ground end of the detection impedance (12) are connected with the ground end (10) through a ground shielding wire (9); a tiny crevasse burr point (15) is arranged on the corona-free lead (8), an ultraviolet imager (16) is arranged right above the tiny crevasse burr point (15), a coaxial cable (13) is connected to the signal output end of the detection impedance (12), and the other end of the coaxial cable (13) is connected with the input end of the partial discharge tester (14).
2. The verification and comparison circuit of the ultraviolet imager as claimed in claim 1, wherein the micro-puncture points (15) are square holes of 1 cm x 1 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911319942.5A CN110988772A (en) | 2019-12-19 | 2019-12-19 | Check-up comparison circuit of ultraviolet imager |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911319942.5A CN110988772A (en) | 2019-12-19 | 2019-12-19 | Check-up comparison circuit of ultraviolet imager |
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| CN110988772A true CN110988772A (en) | 2020-04-10 |
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