CN113156276A - Method for checking and debugging secondary voltage loop in AC withstand voltage test of switchgear bus - Google Patents
Method for checking and debugging secondary voltage loop in AC withstand voltage test of switchgear bus Download PDFInfo
- Publication number
- CN113156276A CN113156276A CN202110199670.0A CN202110199670A CN113156276A CN 113156276 A CN113156276 A CN 113156276A CN 202110199670 A CN202110199670 A CN 202110199670A CN 113156276 A CN113156276 A CN 113156276A
- Authority
- CN
- China
- Prior art keywords
- voltage
- test
- bus
- loop
- withstand
- 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.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 178
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000007547 defect Effects 0.000 claims abstract description 8
- 238000012795 verification Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 24
- 238000007689 inspection Methods 0.000 claims description 14
- 238000010586 diagram Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000004804 winding Methods 0.000 abstract description 18
- 238000000819 phase cycle Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- 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
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
-
- 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
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Relating To Insulation (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention discloses a method for checking and debugging a secondary voltage loop in a switchgear bus alternating-current voltage withstand test, wherein before the switchgear bus alternating-current voltage withstand test, the wiring correctness of the secondary voltage loop is checked and confirmed, and a switchgear bus has alternating-current voltage withstand test conditions; the method is simple and easy to implement, and solves the problem that the secondary voltage loop voltage test cannot check the correctness of the voltage transformer connection group and the loop from the root part to the body terminal box and needs to adopt other test means for special verification. The defect of a voltage test of the secondary voltage loop is overcome, errors that the wiring of the secondary voltage loop does not distinguish polarity and phase sequence and the connection of the open triangular windings is not equal are effectively detected, potential quality accident hazards are eliminated in time, and the accuracy and the integrity of the secondary voltage loop are ensured at the source of the secondary voltage loop; when the alternating-current voltage withstand test of the bus of the switch equipment is carried out, the test of the high-voltage live display device is also completed, and the debugging efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a method for checking and debugging a secondary voltage loop in a bus alternating-current withstand voltage test of switchgear.
Background
The AC voltage withstand test and the secondary voltage loop voltage withstand test are indispensable test items before the power system is put into operation, and are key items for project site debugging and acceptance, the AC voltage withstand test is one of indispensable test items in an electrical equipment handover test and a preventive test, and is a final inspection item before the primary electrical equipment and the installation and maintenance quality are put into operation, a secondary winding of a voltage transformer is connected with devices of a secondary system, such as a relay protection device, a safety automatic device and a metering device, through a secondary cable to form a secondary voltage loop, the secondary voltage is one of main bases of the relay protection device and the safety automatic device for fault judgment of the primary equipment, and the accuracy and the safe operation of the secondary voltage loop are guaranteed to be crucial.
The inspection of the secondary voltage circuit is usually performed by a secondary circuit voltage test method, namely, a relay protection tester is used to input test voltage (the test voltage is input from an air switch after the A-C611, the A-C621, the A-C631 and the L613I in the figure 3 are removed) at the secondary voltage circuit air switch of a voltage transformer body secondary terminal box, the method can not inspect the correctness of the voltage transformer connection group and the root thereof to the body terminal box circuit, a debugging method for performing the secondary voltage circuit inspection based on the AC voltage withstand test is applied, two independent procedures are usually adopted, the AC voltage withstand test and the secondary voltage circuit inspection which respectively belong to the electrical primary and secondary debugging are completed synchronously, the secondary voltage circuit inspection is performed while the AC voltage withstand test of a bus system of the power supply and distribution device is performed, the correctness of the voltage transformer connection group and the root thereof to the body terminal box circuit is inspected, the defect of a voltage test of the secondary voltage loop is overcome, errors that the wiring of the secondary voltage loop does not distinguish polarity and phase sequence and the connection of the open triangular windings is not equal are effectively detected, potential quality accident hazards are eliminated in time, and the accuracy and the integrity of the secondary voltage loop are ensured at the source of the secondary voltage loop; when the alternating-current voltage withstand test of the bus of the switch equipment is carried out, the test of the high-voltage live display device is also completed, and the debugging efficiency is greatly improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for checking and debugging a secondary voltage loop in a bus alternating-current withstand voltage test of switchgear, which aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the method for checking and debugging the secondary voltage loop in the alternating current withstand voltage test of the bus of the switch equipment comprises the following steps of:
s1, checking and confirming the wiring correctness of the secondary voltage loop before the AC voltage withstand test of the bus of the switch equipment, wherein the bus of the switch equipment has AC voltage withstand test conditions;
s2, performing alternating current withstand voltage test in a split-phase mode, adding voltage to a tested phase, grounding the other two phases in a short circuit mode, performing wiring according to a bus A alternating current withstand voltage test wiring schematic diagram, adding test voltage to the A phase, grounding the B, C phase in a short circuit mode, and selecting an adaptive conventional test transformer or a resonant device according to system voltage and load properties by alternating current withstand voltage test equipment;
s3, disconnecting an external circuit of a switchgear bus, and connecting all electrical equipment including each switchgear, a lightning arrester, a bus voltage transformer and a high-voltage live display device sensor into a bus system through one-time operation, wherein the bus voltage transformer is in a wiring mode that a widely-applied typical wiring YN/YN and do voltage transformer secondary voltage loop air switch is arranged at a disconnection position, and the secondary side of a current transformer is in short circuit connection and is grounded;
s4, testing the high-voltage live display device, namely gradually increasing the test voltage according to the specification of high-voltage live display device (VPIS) (GB25081-2010), observing whether the electrical equipment and the test equipment are abnormal until the display unit A phase of the high-voltage live display device displays electricity, recording the UVP value of the applied line-to-ground test voltage, and if the UVP value has an interlocking function, when the display unit A phase displays electricity, sending a locking command by an interlocking signal output unit, wherein all the high-voltage live display devices of the bus system need to be checked one by one;
s5, continuously boosting to a system rated phase voltage Ue, checking the correctness of a voltage transformer connection group and a loop from the root part of the voltage transformer connection group to a body terminal box under the system rated phase voltage Ue, measuring and recording the secondary voltage of each group of voltage transformers at the inlet end of a secondary voltage air switch of the body terminal box, wherein the measured value is in accordance with the secondary voltage measurement theoretical value when the voltage is applied to the surface 1YN/YN and do for the first time;
s6, after the inspection is finished, reducing the test voltage to zero, cutting off the test power supply, withdrawing the electrical equipment such as a lightning arrester, a voltage transformer and the like, and leading the secondary terminal of the electrified sensor of the high-voltage electrified display device to the three-phase short circuit of the voltage input loops a, b and c of the display and grounding;
s7, gradually increasing the test voltage, and continuously completing the alternating current withstand voltage test of the switchgear bus according to the voltage grade of the tested product and the standard requirement;
s8, cutting off a test power supply after the A-phase alternating current withstand voltage test process is completed;
s9, repeating the steps, and similarly, respectively carrying out an alternating current withstand voltage test on B, C phases;
s10, after the AC withstand voltage test process is completed, cutting off a test power supply, connecting a voltage transformer into a bus system again, connecting a bus A, B, C three-phase parallel voltage test wiring diagram, short-circuiting A, B, C three phases of a switchgear bus, applying a system rated phase voltage Ue by using AC withstand voltage test equipment, checking the correctness of a voltage transformer connection group and a loop from the root part to a body terminal box, measuring and recording the secondary voltage of each group of voltage transformers at the inlet end of a secondary voltage air switch of the body terminal box, wherein the measured value is in accordance with the secondary voltage measurement theoretical value when the YN/YN and do are subjected to primary voltage application in the table 1;
s11, if the result of measuring the secondary voltage of each group of voltage transformers at the inlet end of the secondary voltage air switch of the main terminal box when the primary side single-phase voltage and the three-phase parallel voltage are applied to the voltage transformers is in accordance with the theoretical value of secondary voltage measurement when the primary voltage is applied to the YN/YN and the do of the table 1, the connection group of the voltage transformers and the loop from the root thereof to the main terminal box can be judged to be correct, and if the result is not in accordance, the measurement result needs to be analyzed, judged and processed;
and S12, finishing debugging of secondary voltage loop inspection based on the AC withstand voltage test of the bus of the switch equipment, turning off the power supply, and recovering wiring.
The technical scheme is further optimized, the test phase splitting is carried out, the voltage is added to the tested phase, the other two phases are grounded in a short circuit mode, and the test of all the high-voltage charged display devices of the bus system is completed.
Further optimizing the technical scheme, the test of the high-voltage live display device and the measurement of the corresponding pressurized phase voltage of the voltage transformer at the terminal box of the body ensure the one-to-one correspondence relationship between the A, B, C three phases at the primary side and the a, b and c three phases at the secondary side of the bus of the switch equipment.
According to the technical scheme, when the alternating-current voltage withstand test of the bus of the switchgear is carried out, the secondary voltage of each group of voltage transformers is measured at the inlet end of the secondary voltage air switch of the body terminal box through single-phase addition rated voltage and three-phase parallel connection rated voltage, the accuracy of the transformation ratio, the polarity, the connection group and wiring to the terminal box of each group of voltage transformers is confirmed, and the defect that the correctness of the connection group of the voltage transformers and the correctness of the connection group of the voltage transformers from the root part to the body terminal box of the secondary circuit through-voltage test cannot be detected is overcome.
Further optimizing the technical scheme, the alternating current withstand voltage test and the secondary voltage loop check which are usually used as two independent electrical debugging processes and belong to the electrical primary and secondary debugging contents are cooperatively completed when the alternating current withstand voltage test of the bus of the switchgear is carried out.
Further optimizing the technical scheme, the required test equipment is alternating current withstand voltage test equipment and a universal meter; when the alternating-current voltage withstand test of the bus of the switchgear is carried out, rated operation voltage is applied to the primary side of the bus system, secondary voltage measurement is carried out on the inlet wire end of the air switch of the outlet terminal box on the secondary side of the bus voltage transformer, the measurement result is analyzed, the correctness of the voltage transformer connection group and the secondary voltage loop from the root part of the voltage transformer connection group to the main body terminal box is confirmed without adopting other test means for special verification, and other voltage loops connected with secondary system equipment are carried out according to a secondary loop through-voltage test method.
The technical scheme is further optimized, and when the AC voltage withstand test of the bus of the switch equipment is carried out, the test of the high-voltage live display device is completed; when a switchgear bus alternating-current withstand voltage test is carried out, the one-to-one correspondence relationship between the three phases of the primary side A, B, C and the secondary side a, b and c of the switchgear bus is verified, and the method is suitable for debugging the AC switchgear bus of each voltage class before the AC switchgear bus is put into operation; the method analyzes typical wiring YN/YN and do which are widely applied in a bus voltage transformer wiring mode, and similarly, secondary voltage loops of each group of voltage transformers connected with a tested switchgear bus can be checked.
Compared with the prior art, the invention provides a method for checking and debugging a secondary voltage loop in a switchgear bus alternating-current withstand voltage test, which has the following beneficial effects:
the method for checking and debugging the secondary voltage loop of the alternating current withstand voltage test of the switch equipment bus has simple and easy technological method, and solves the problem that the secondary voltage loop voltage test cannot check the correctness of the voltage transformer connection group and the loop from the root part to the body terminal box and needs to adopt other test means for special verification. The defect of a voltage test of the secondary voltage loop is overcome, errors that the wiring of the secondary voltage loop does not distinguish polarity and phase sequence and the connection of the open triangular windings is not equal are effectively detected, potential quality accident hazards are eliminated in time, and the accuracy and the integrity of the secondary voltage loop are ensured at the source of the secondary voltage loop; when the alternating-current voltage withstand test of the bus of the switch equipment is carried out, the test of the high-voltage live display device is also completed, and the debugging efficiency is greatly improved.
Drawings
FIG. 1 is a wiring diagram for bus A AC withstand voltage test;
FIG. 2 is a three-phase parallel voltage test wiring diagram of bus A, B, C;
fig. 3 is a wiring schematic diagram of a 115kV bus voltage transformer of a certain substation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Example (b):
referring to fig. 1 to 3, a method for checking and debugging a secondary voltage loop in an ac withstand voltage test of a bus of a switchgear includes the following steps:
s1, checking and confirming the wiring correctness of the secondary voltage loop before the AC voltage withstand test of the bus of the switch equipment, wherein the bus of the switch equipment has AC voltage withstand test conditions;
s2, carrying out AC voltage withstand test in a split-phase mode, adding voltage to be tested, grounding the other two phases in a short circuit mode, carrying out wiring according to a wiring principle diagram of an A-phase AC voltage withstand test of a bus in the figure 1, adding test voltage to the A-phase AC voltage withstand test, grounding the B, C-phase AC voltage withstand test, and selecting an adaptive conventional test transformer or a resonant device according to system voltage and load properties by AC voltage withstand test equipment;
s3, disconnecting an external line of a switchgear bus, and connecting all electrical equipment including each switchgear, a lightning arrester, a bus voltage transformer and a high-voltage live display device sensor into a bus system through one-time operation, wherein the bus voltage transformer is in a wiring mode of a widely-applied typical wiring YN/YN and do (open-delta connection opening triangle connection do, see figure 3), a voltage transformer secondary voltage loop air switch is arranged at a disconnection position, and the secondary side of a current transformer is in short circuit connection with the ground;
s4, testing the high-voltage live display device, namely gradually increasing the test voltage according to the specification of high-voltage live display device (VPIS) (GB25081-2010), observing whether the electrical equipment and the test equipment are abnormal until the display unit A phase of the high-voltage live display device displays electricity, recording the UVP value of the applied line-to-ground test voltage, and if the UVP value has an interlocking function, when the display unit A phase displays electricity, sending a locking command by an interlocking signal output unit, wherein all the high-voltage live display devices of the bus system need to be checked one by one;
s5, continuously boosting to a system rated phase voltage Ue, checking the correctness of a voltage transformer connection group and a loop from the root part of the voltage transformer connection group to a body terminal box under the system rated phase voltage Ue, measuring and recording the secondary voltage of each group of voltage transformers at the inlet end of a secondary voltage air switch of the body terminal box, wherein the measured value is in accordance with the secondary voltage measurement theoretical value when the voltage is applied to the surface 1YN/YN and do for the first time;
s6, after the inspection is finished, reducing the test voltage to zero, cutting off the test power supply, withdrawing the electrical equipment such as a lightning arrester, a voltage transformer and the like, and leading the secondary terminal of the electrified sensor of the high-voltage electrified display device to the three-phase short circuit of the voltage input loops a, b and c of the display and grounding;
s7, gradually increasing the test voltage, and continuously completing the alternating current withstand voltage test of the switchgear bus according to the voltage grade of the tested product and the standard requirement;
s8, cutting off a test power supply after the A-phase alternating current withstand voltage test process is completed;
s9, repeating the steps, and similarly, respectively carrying out an alternating current withstand voltage test on B, C phases;
s10, after the AC withstand voltage test process is completed, cutting off a test power supply, connecting a voltage transformer into a bus system again, connecting wires according to a bus A, B, C three-phase parallel voltage test wiring diagram in fig. 2, short-circuiting A, B, C three phases of a bus of the switch equipment, applying a system rated phase voltage Ue by using the AC withstand voltage test equipment, checking the correctness of a voltage transformer connection group and a loop from the root part of the voltage transformer connection group to a body terminal box, measuring and recording the secondary voltage of each group of voltage transformers at the inlet end of a secondary voltage air switch of the body terminal box, wherein the measured value is in accordance with the secondary voltage measurement theoretical value when the voltages are applied to the surfaces of YN/YN and do in the table 1;
s11, if the result of measuring the secondary voltage of each group of voltage transformers at the inlet end of the secondary voltage air switch of the main terminal box when the primary side single-phase voltage and the three-phase parallel voltage are applied to the voltage transformers is in accordance with the theoretical value of secondary voltage measurement when the primary voltage is applied to the YN/YN and the do of the table 1, the connection group of the voltage transformers and the loop from the root thereof to the main terminal box can be judged to be correct, and if the result is not in accordance, the measurement result needs to be analyzed, judged and processed;
and S12, finishing debugging of secondary voltage loop inspection based on the AC withstand voltage test of the bus of the switch equipment, turning off the power supply, and recovering wiring.
As a specific optimization scheme of this embodiment, a test is performed in a split phase manner, the voltage is added to the tested phases, and the other two phases are grounded in a short circuit manner, so that tests of all high-voltage charged display devices of the bus system are completed.
As a specific optimization scheme of the embodiment, the test of the high-voltage live display device and the measurement of the corresponding pressurized phase voltage of the voltage transformer at the terminal box of the body ensure the one-to-one correspondence relationship between the three phases a, b and c on the primary side A, B, C and the secondary side of the bus of the switchgear.
As a specific optimization scheme of this embodiment, when a bus ac voltage withstand test of the switchgear is performed, secondary voltages of the voltage transformers of each group are measured at the incoming line end of the secondary voltage air switch of the terminal box of the main body by applying a rated voltage in a single phase (an applied voltage, and other two phases are grounded in a short circuit) and applying a rated voltage in a parallel three phase, so that the accuracy of transformation ratio, polarity, connection group and wiring to the terminal box of each group of voltage transformers is confirmed, and the defect that the correctness of the connection group of the voltage transformers and the root of the connection group of the voltage transformers to the terminal box of the main body cannot be checked in a secondary circuit voltage-passing test is overcome.
As a specific optimization scheme of the embodiment, the ac withstand voltage test and the secondary voltage circuit check, which are usually two independent electrical debugging processes and belong to the electrical primary and secondary debugging contents, are cooperatively completed when the ac withstand voltage test of the switchgear bus is performed.
As a specific optimization scheme of this embodiment, the required test devices are an alternating current withstand voltage test device and a multimeter; when the AC voltage withstand test of the bus of the switchgear is carried out, rated operation voltage is applied to the primary side of the bus system, secondary voltage measurement is carried out on the wire inlet end of an air switch (see figures 3F811, F812, F813 and the like) of a wire outlet terminal box on the secondary side of a bus voltage transformer, the measurement result is analyzed, the correctness of a voltage transformer coupling group and a secondary voltage loop of the root part of the voltage transformer coupling group to a main body terminal box is confirmed without adopting other test means for special verification, and other voltage loops connected with secondary system equipment are carried out according to a secondary loop voltage-passing test method.
As a specific optimization scheme of the embodiment, when a bus alternating-current withstand voltage test of the switchgear is performed, the test of the high-voltage live display device is completed; when a switchgear bus alternating-current withstand voltage test is carried out, the one-to-one correspondence relationship between the three phases of the primary side A, B, C and the secondary side a, b and c of the switchgear bus is verified, and the method is suitable for debugging the AC switchgear bus of each voltage class before the AC switchgear bus is put into operation; the method analyzes typical wiring YN/YN and do (see figure 3) which are widely applied in a bus voltage transformer wiring mode, and similarly, secondary voltage loops of each group of voltage transformers (an incoming line voltage transformer, a metering voltage transformer and the like) connected with a bus of the tested switchgear can be checked.
The debugging method for performing the secondary voltage loop check in the ac withstand voltage test of the switchgear bus has been applied to a plurality of projects.
The process of the invention has feasibility: the alternating-current voltage withstand test of the bus of the switch equipment and the secondary voltage loop inspection of the bus voltage transformer are both test items with standard requirements and are also key contents of completion acceptance inspection. The alternating-current voltage withstand test of the bus of the switch equipment is carried out according to the requirements of effective versions of the standards such as 'electric equipment handover test standard of electric device installation engineering', 'gas insulated metal enclosed switch equipment field voltage withstand and insulation test guide' and the like; the high-voltage live display device was tested according to the regulations of high-voltage live display device (VPIS) (GB 25081-2010).
According to the requirement, capacity and the like of tested equipment on test voltage, the alternating-current withstand voltage test selects adaptive conventional test transformers or resonance devices and other test equipment, a universal meter is used for measuring the secondary side voltage of the bus voltage transformer when the alternating-current withstand voltage test of the switching equipment bus is carried out, the accuracy of the transformation ratio, polarity, connection group and wiring to a terminal box of each group of voltage transformers connected to a bus system is confirmed through the measured value, and the accuracy and integrity of the secondary voltage circuit are ensured at the source of the secondary voltage circuit.
Three single-phase voltage transformers are connected into an YN/YN and a do (open-delta connection do) which are typical connections of bus voltage transformers of switchgear widely used at present, as shown in a schematic diagram of connection of 115kV bus voltage transformers of a certain transformer substation in fig. 3. The primary side terminal of the single-phase voltage transformer product is identified as A, N, the secondary side can be provided with 1-3 groups of basic windings and a group of auxiliary windings according to the use requirement, the terminals of the basic windings are respectively identified as 1a, 1n, 2a, 2n, 3a and 3n, if only one group is available, the terminals are identified as a and n; the auxiliary winding terminals are identified as da, dn. The primary sides of the three single-phase voltage transformers are in star connection; the basic windings on the secondary side are in star connection, the line voltage and the phase voltage of a three-phase power grid are collected, and power is supplied to secondary devices such as a metering device, a measurement and control device and a protection device; the auxiliary winding of the secondary side is connected in an open triangle way, and the open triangle voltage is collected to be zero-sequence voltage. When single-phase voltage application and three-phase parallel voltage application are carried out on the bus side, secondary voltages with the same phase and proportional amplitude as those of the primary side are induced on the secondary side of the voltage transformer corresponding to the bus side, and the voltage value is measured on the secondary side, wherein the amplitude of the secondary voltages accords with the table 1. Table 1 shows the theoretical values of secondary voltage measurements when voltage Ue is applied to YN/3 x YN and do once. Table 1 as shown below, the following examples,
TABLE 1
Note: if U isL6131/A611＝3*Ue/Kdo-Ue/KyThen the open delta winding is positive polarity (+3UO connection). If U isL6131/A611＝3*Ue/Kdo+Ue/KyAnd the open delta winding is connected in a reverse polarity mode.
In table 1: ue-system nominal phase voltage; UA611/N600, UB611/N600, UC 611/N600; UA621/N600, UB621/N600, UC 621/N600; UA631/N600, UB631/N600 and UC631/N600 are phase voltages of a phase, b phase and c phase of the secondary side of each star-shaped connection winding respectively; UA611/B611, UB611/C611, UC 611/A611; UA621/B621, U B621/C621, U C621/A621; UA631/B631, UB631/C631 and UC 631/A631-are respectively line voltages of the secondary side of the star-shaped connection winding; UL 613I/N600-open delta tied winding open voltage; ky-transformation ratio of star-shaped connection winding of the voltage transformer; kdo-transformation ratio of open delta connection winding of voltage transformer.
In the debugging method for checking the secondary voltage loop based on the alternating-current withstand voltage test of the bus of the switch equipment, when single-phase voltage application and three-phase parallel voltage application are carried out on the bus side, the voltage value is measured on the secondary side, the measurement result is recorded according to the content of the table 1 so as to be convenient for analysis and judgment, if the measured voltage value meets the theoretical analysis value of the table 1, the transformation ratio, the polarity and the connection group of the group of voltage transformers and the wiring to the terminal box can be judged to be correct, and the accuracy and the integrity of the voltage loop are ensured at the source.
High voltage live display (VPIS) test principle: when the bus of the switch equipment is subjected to an alternating current withstand voltage test, a sensing unit (indoor or outdoor, capacitive, resistive, inductive, optical, contact, non-contact and the like) of a high-voltage live display device divides a primary high voltage of a primary live conductor and samples the divided voltage to obtain a secondary low voltage matched with a display unit, and the secondary low voltage is tested according to the regulations of high-voltage live display device (VPIS) (GB 25081-2010). The single-added primary voltage also verifies the one-to-one correspondence relationship between the three phases of the primary side A, B, C and the three phases a, b, c of the secondary side of the switchgear bus.
The invention has the beneficial effects that: the method for checking and debugging the secondary voltage loop of the alternating current withstand voltage test of the switch equipment bus has simple and easy technological method, and solves the problem that the secondary voltage loop voltage test cannot check the correctness of the voltage transformer connection group and the loop from the root part to the body terminal box and needs to adopt other test means for special verification. The defect of a voltage test of the secondary voltage loop is overcome, errors that the wiring of the secondary voltage loop does not distinguish polarity and phase sequence and the connection of the open triangular windings is not equal are effectively detected, potential quality accident hazards are eliminated in time, and the accuracy and the integrity of the secondary voltage loop are ensured at the source of the secondary voltage loop; when the alternating-current voltage withstand test of the bus of the switch equipment is carried out, the test of the high-voltage live display device is also completed, and the debugging efficiency is greatly improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The method for checking and debugging the secondary voltage loop in the AC withstand voltage test of the bus of the switch equipment is characterized by comprising the following steps of:
s1, checking and confirming the wiring correctness of the secondary voltage loop before the AC voltage withstand test of the bus of the switch equipment, wherein the bus of the switch equipment has AC voltage withstand test conditions;
s2, performing alternating current withstand voltage test in a split-phase mode, adding voltage to a tested phase, grounding the other two phases in a short circuit mode, performing wiring according to a bus A alternating current withstand voltage test wiring schematic diagram, adding test voltage to the A phase, grounding the B, C phase in a short circuit mode, and selecting an adaptive conventional test transformer or a resonant device according to system voltage and load properties by alternating current withstand voltage test equipment;
s3, disconnecting an external circuit of a switchgear bus, and connecting all electrical equipment including each switchgear, a lightning arrester, a bus voltage transformer and a high-voltage live display device sensor into a bus system through one-time operation, wherein the bus voltage transformer is in a wiring mode that a widely-applied typical wiring YN/YN and do voltage transformer secondary voltage loop air switch is arranged at a disconnection position, and the secondary side of a current transformer is in short circuit connection and is grounded;
s4, testing the high-voltage live display device, namely gradually increasing the test voltage according to the specification of high-voltage live display device (VPIS) (GB25081-2010), observing whether the electrical equipment and the test equipment are abnormal until the display unit A phase of the high-voltage live display device displays electricity, recording the UVP value of the applied line-to-ground test voltage, and if the UVP value has an interlocking function, when the display unit A phase displays electricity, sending a locking command by an interlocking signal output unit, wherein all the high-voltage live display devices of the bus system need to be checked one by one;
s5, continuously boosting to a system rated phase voltage Ue, checking the correctness of a voltage transformer connection group and a loop from the root part of the voltage transformer connection group to a body terminal box under the system rated phase voltage Ue, measuring and recording the secondary voltage of each group of voltage transformers at the inlet end of a secondary voltage air switch of the body terminal box, wherein the measured value is in accordance with the secondary voltage measurement theoretical value when the voltage is applied to the surface 1YN/YN and do for the first time;
s6, after the inspection is finished, reducing the test voltage to zero, cutting off the test power supply, withdrawing the electrical equipment such as a lightning arrester, a voltage transformer and the like, and leading the secondary terminal of the electrified sensor of the high-voltage electrified display device to the three-phase short circuit of the voltage input loops a, b and c of the display and grounding;
s7, gradually increasing the test voltage, and continuously completing the alternating current withstand voltage test of the switchgear bus according to the voltage grade of the tested product and the standard requirement;
s8, cutting off a test power supply after the A-phase alternating current withstand voltage test process is completed;
s9, repeating the steps, and similarly, respectively carrying out an alternating current withstand voltage test on B, C phases;
s10, after the AC withstand voltage test process is completed, cutting off a test power supply, connecting a voltage transformer into a bus system again, connecting a bus A, B, C three-phase parallel voltage test wiring diagram, short-circuiting A, B, C three phases of a switchgear bus, applying a system rated phase voltage Ue by using AC withstand voltage test equipment, checking the correctness of a voltage transformer connection group and a loop from the root part to a body terminal box, measuring and recording the secondary voltage of each group of voltage transformers at the inlet end of a secondary voltage air switch of the body terminal box, wherein the measured value is in accordance with the secondary voltage measurement theoretical value when the YN/YN and do are subjected to primary voltage application in the table 1;
s11, if the result of measuring the secondary voltage of each group of voltage transformers at the inlet end of the secondary voltage air switch of the main terminal box when the primary side single-phase voltage and the three-phase parallel voltage are applied to the voltage transformers is in accordance with the theoretical value of secondary voltage measurement when the primary voltage is applied to the YN/YN and the do of the table 1, the connection group of the voltage transformers and the loop from the root thereof to the main terminal box can be judged to be correct, and if the result is not in accordance, the measurement result needs to be analyzed, judged and processed;
and S12, finishing debugging of secondary voltage loop inspection based on the AC withstand voltage test of the bus of the switch equipment, turning off the power supply, and recovering wiring.
2. The method for inspecting and debugging the secondary voltage loop in the AC withstand voltage test of the bus of the switch equipment according to claim 1, wherein the test is performed in a split phase manner, the voltage is added to the tested phases, and the other two phases are grounded in a short circuit manner, so that the test of all high-voltage live display devices of the bus system is completed.
3. The method for checking and debugging the secondary voltage loop of the AC withstand voltage test of the bus of the switchgear as claimed in claim 1, wherein the testing of the high voltage live display device and the measurement of the corresponding voltage of the voltage transformer at the body terminal box ensure the one-to-one correspondence of the three phases a, b and c on the primary side A, B, C and the secondary side of the bus of the switchgear.
4. The method for inspecting and debugging the secondary voltage loop of the AC voltage withstand test of the bus of the switch equipment according to claim 1, wherein when the AC voltage withstand test of the bus of the switch equipment is carried out, the secondary voltages of all groups of voltage transformers are measured at the inlet end of the secondary voltage air switch of the terminal box of the body by adding rated voltages in a single phase and adding rated voltages in a three-phase parallel connection, so that the accuracy of transformation ratio, polarity, connection group and wiring to the terminal box of all groups of voltage transformers is confirmed, and the defect that the correctness of the connection group of the voltage transformers and the correctness of the root parts of the connection group of the voltage transformers to the terminal box of the body cannot be detected in the voltage withstand test of the secondary loop is overcome.
5. The method for inspecting and debugging the secondary voltage circuit in the ac withstand voltage test for the switchgear bus according to claim 1, wherein the ac withstand voltage test and the secondary voltage circuit inspection, which are normally performed as two independent electrical debugging processes and belong to the contents of the electrical primary and secondary debugging, are cooperatively completed when the ac withstand voltage test for the switchgear bus is performed.
6. The method for inspecting and debugging the secondary voltage loop in the AC withstand voltage test of the switch equipment bus according to claim 1, wherein the required test equipment is AC withstand voltage test equipment and a multimeter; when the alternating-current voltage withstand test of the bus of the switchgear is carried out, rated operation voltage is applied to the primary side of the bus system, secondary voltage measurement is carried out on the inlet wire end of the air switch of the outlet terminal box on the secondary side of the bus voltage transformer, the measurement result is analyzed, the correctness of the voltage transformer connection group and the secondary voltage loop from the root part of the voltage transformer connection group to the main body terminal box is confirmed without adopting other test means for special verification, and other voltage loops connected with secondary system equipment are carried out according to a secondary loop through-voltage test method.
7. The method for inspecting and debugging the secondary voltage loop in the AC withstand voltage test of the switchgear bus according to claim 1, wherein the test of the high-voltage live display device is completed when the AC withstand voltage test of the switchgear bus is performed; when a switchgear bus alternating-current withstand voltage test is carried out, the one-to-one correspondence relationship between the three phases of the primary side A, B, C and the secondary side a, b and c of the switchgear bus is verified, and the method is suitable for debugging the AC switchgear bus of each voltage class before the AC switchgear bus is put into operation; the method analyzes typical wiring YN/YN and do which are widely applied in a bus voltage transformer wiring mode, and similarly, secondary voltage loops of each group of voltage transformers connected with a tested switchgear bus can be checked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110199670.0A CN113156276B (en) | 2021-02-22 | 2021-02-22 | Method for checking and debugging secondary voltage loop of bus alternating-current withstand voltage test of switching equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110199670.0A CN113156276B (en) | 2021-02-22 | 2021-02-22 | Method for checking and debugging secondary voltage loop of bus alternating-current withstand voltage test of switching equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113156276A true CN113156276A (en) | 2021-07-23 |
| CN113156276B CN113156276B (en) | 2024-03-29 |
Family
ID=76883251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110199670.0A Active CN113156276B (en) | 2021-02-22 | 2021-02-22 | Method for checking and debugging secondary voltage loop of bus alternating-current withstand voltage test of switching equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113156276B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866680A (en) * | 2021-09-14 | 2021-12-31 | 国网天津市电力公司 | Intelligent tester for AC loop group |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005241297A (en) * | 2004-02-24 | 2005-09-08 | J-Power Systems Corp | Withstand voltage test method of power equipment |
| JP2009236662A (en) * | 2008-03-27 | 2009-10-15 | Takaoka Electric Mfg Co Ltd | Method of testing transformer for gauge |
| CN102510010A (en) * | 2011-10-13 | 2012-06-20 | 河北省电力建设调整试验所 | Method for checking and testing relay protection vector before operation of newly-built transformer station |
| CN102565618A (en) * | 2012-01-31 | 2012-07-11 | 云南电网公司 | Method for detecting zero-sequence voltage circuit of transformer substation |
| CN102565614A (en) * | 2012-01-11 | 2012-07-11 | 云南电网公司 | Alternating voltage loop test method |
| CN104345245A (en) * | 2013-07-26 | 2015-02-11 | 中冶天工上海十三冶建设有限公司 | Method for checking voltage transformer wiring correctness by using transformer turn ratio & group tester |
| CN104698335A (en) * | 2013-12-06 | 2015-06-10 | 中冶天工集团有限公司 | Method for debugging high-voltage transformer substation in systematization mode by using low tension electricity |
-
2021
- 2021-02-22 CN CN202110199670.0A patent/CN113156276B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005241297A (en) * | 2004-02-24 | 2005-09-08 | J-Power Systems Corp | Withstand voltage test method of power equipment |
| JP2009236662A (en) * | 2008-03-27 | 2009-10-15 | Takaoka Electric Mfg Co Ltd | Method of testing transformer for gauge |
| CN102510010A (en) * | 2011-10-13 | 2012-06-20 | 河北省电力建设调整试验所 | Method for checking and testing relay protection vector before operation of newly-built transformer station |
| CN102565614A (en) * | 2012-01-11 | 2012-07-11 | 云南电网公司 | Alternating voltage loop test method |
| CN102565618A (en) * | 2012-01-31 | 2012-07-11 | 云南电网公司 | Method for detecting zero-sequence voltage circuit of transformer substation |
| CN104345245A (en) * | 2013-07-26 | 2015-02-11 | 中冶天工上海十三冶建设有限公司 | Method for checking voltage transformer wiring correctness by using transformer turn ratio & group tester |
| CN104698335A (en) * | 2013-12-06 | 2015-06-10 | 中冶天工集团有限公司 | Method for debugging high-voltage transformer substation in systematization mode by using low tension electricity |
Non-Patent Citations (1)
| Title |
|---|
| 陈曦;朱江;: "一次加压在智能化变电站中的应用――结合耐压试验完成验证二次电压回路的可行性研究", 城市地理, no. 04 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866680A (en) * | 2021-09-14 | 2021-12-31 | 国网天津市电力公司 | Intelligent tester for AC loop group |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113156276B (en) | 2024-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205080251U (en) | Through -flow calibration system of current transformer secondary circuit | |
| CN101354418B (en) | Power transformer test method without disconnecting wire | |
| CN102540001B (en) | Method of checking alternating current loop of a 500kV transformer substation through carrying out simulated through-type three-phase short circuit | |
| CN110031718B (en) | Method for verifying integrity of alternating current circuit by pressurizing low-voltage side of railway traction station | |
| CN102780234B (en) | High-voltage electric debugging method for power generation project | |
| CN102565618A (en) | Method for detecting zero-sequence voltage circuit of transformer substation | |
| CN102608485B (en) | Detection method for zero-sequence current loops of transformer substations | |
| CN106569075A (en) | Main transformer and high voltage side cable zero-sequence differential protection polarity test circuit and method | |
| CN101539616A (en) | Method for detecting accuracy of optical current transformer for measuring | |
| CN115267640A (en) | Current transformer abnormity checking method, system, equipment and medium | |
| CN113162040B (en) | System and method for power supply non-voltage nuclear phase for high-voltage plant of power plant | |
| CN105182156A (en) | Waveform visualization based same-period loop polarity detection apparatus and detection method | |
| CN113156276B (en) | Method for checking and debugging secondary voltage loop of bus alternating-current withstand voltage test of switching equipment | |
| CN107831378B (en) | Device and method for detecting compensation effect of arc suppression coil | |
| CN105548821A (en) | Lightning arrester live detection method | |
| CN102565614B (en) | Alternating voltage loop test method | |
| CN211453813U (en) | Novel transformer differential protection calibration device | |
| CN113109662A (en) | Method and system for determining relative aging degree of cable based on interphase relative dielectric loss | |
| CN107271775B (en) | electric power overhead line phase detection method | |
| CN105807193A (en) | Same-frequency same-phase voltage withstanding test device with safety sampling signals | |
| CN103245842B (en) | 10 ~ 35kV new clothes electric device total system dry run detection method | |
| CN103454553A (en) | Secondary side phase checking device of voltage transformer | |
| CN110716111A (en) | Ultrahigh-voltage XLPE cable insulation online monitoring device and method based on vector method | |
| CN218470957U (en) | Low-voltage power test and transmission testing device before power reception of high-voltage system | |
| Arri et al. | On-line monitoring of electrodynamic effects on power transformers windings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |