CN111624426A - System and method for verifying bus differential protection polarity in double-bus system wiring mode - Google Patents
System and method for verifying bus differential protection polarity in double-bus system wiring mode Download PDFInfo
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- CN111624426A CN111624426A CN202010491466.1A CN202010491466A CN111624426A CN 111624426 A CN111624426 A CN 111624426A CN 202010491466 A CN202010491466 A CN 202010491466A CN 111624426 A CN111624426 A CN 111624426A
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of AC or of pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- 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
- G01R31/55—Testing for incorrect line connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
本发明公开了一种双母线系统接线方式母差保护极性的校验系统及方法，包括I母单元、1号发电机单元、2号发电机间隔单元、线路1间隔单元、线路2间隔单元、母联间隔单元及II母单元；I母单元与1号发电机单元、2号发电机间隔单元、线路1间隔单元、线路2间隔单元及母联间隔单元相连接，II母单元与1号发电机单元、2号发电机间隔单元、线路1间隔单元、线路2间隔单元及母联间隔单元相连接，该系统及方法能够在升压站受电前完成双母线系统接线方式母差保护极性的校验，且安全性及操作性较高，节省机组并网的时间和提高可靠性。
The invention discloses a system and method for verifying the polarity of the bus differential protection in the wiring mode of a double-bus system, including a bus unit 1, a generator unit No. 1, a generator interval unit No. 2, a line 1 interval unit, and a line 2 interval unit , bus tie bay unit and II bus unit; I bus unit is connected with No. 1 generator unit, No. 2 generator bay unit, line 1 bay unit, line 2 bay unit and bus tie bay unit, II bus unit is connected with No. 1 bay unit The generator unit, the No. 2 generator bay unit, the line 1 bay unit, the line 2 bay unit and the bus tie bay unit are connected, and the system and method can complete the wiring mode bus differential protection pole of the double bus system before the booster station receives power It has high safety and operability, saves the time of unit connection to the grid and improves reliability.
Description
Technical Field
The invention belongs to the technical field of electric power debugging and electric power testing, and relates to a system and a method for checking bus differential protection polarity in a double-bus system wiring mode.
Background
The wiring mode of the double-bus system has certain selectivity, all power supplies and outgoing lines are connected to the I bus or the II bus through the circuit breaker and the isolating switch, and the two buses are connected through the bus coupler switch. In the whole set of starting process, the generator is connected to the grid and is loaded, then the load current is used for checking the bus differential protection polarity, and the bus differential protection is put into use after the protection polarity is correct. If the bus differential protection polarity is wrong, the unit is required to be disconnected, and the load check is carried out after the correction, and the bus differential protection can be put into the bus differential protection formally until the bus differential protection polarity is all correct. Although the correctness of the bus differential protection polarity can be checked in advance through one through-current test during system debugging, the phenomenon that the protection device is mistakenly operated or refused to operate due to wrong configuration of the bus differential protection polarity must be avoided through unit load current check.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for checking the bus differential protection polarity of a double-bus system in a wiring mode.
In order to achieve the purpose, the double-bus system wiring mode bus differential protection polarity checking system comprises a bus unit I, a generator unit No. 1, a generator interval unit No. 2, a line interval unit 1, a line interval unit No. 2, a bus coupling interval unit and a bus unit II;
the I female unit is connected with the 1 # generator unit, the 2 # generator spacing unit, the 1 circuit spacing unit, the 2 circuit spacing unit and the female connection spacing unit, and the II female unit is connected with the 1 # generator unit, the 2 # generator spacing unit, the 1 circuit spacing unit, the 2 circuit spacing unit and the female connection spacing unit.
The No. 1 power generator unit comprises a No. 1 power generator, a No. 1 main transformer, a first main transformer high-voltage side isolation disconnecting link, a first main transformer high-voltage side grounding disconnecting link, a first current transformer, a first circuit breaker, a first I bus isolation disconnecting link, a first II bus isolation disconnecting link and a first bus side grounding disconnecting link;
no. 1 generator is connected with the one end of first circuit breaker through No. 1 main transformer and first main transformer high voltage side isolation switch, the other end of first circuit breaker and the one end of the female isolation switch of first I, the one end of the female isolation switch of first II and the one end of first bus side ground connection switch are connected, the other end of the female isolation switch of first I is connected with the female unit of I, the other end of the female isolation switch of first II is connected with the female unit of II, the other end ground connection of first bus side ground connection switch, the circuit between first main transformer high voltage side isolation switch and the first circuit breaker is through first main transformer high voltage side ground connection switch ground connection, first current transformer installs on the circuit between first main transformer high voltage side isolation switch and the first circuit breaker.
The No. 2 generator interval unit comprises a No. 2 generator, a No. 2 main transformer, a second main transformer high-voltage side isolation disconnecting link, a second main transformer high-voltage side grounding disconnecting link, a second current transformer, a second circuit breaker, a second I bus isolation disconnecting link, a second II bus isolation disconnecting link and a second bus side grounding disconnecting link;
the No. 2 generator is connected with one end of a second circuit breaker through a No. 2 main transformer and a second main transformer high-voltage side isolation disconnecting link, the other end of the second circuit breaker is connected with one end of a second I bus isolation disconnecting link, one end of a second II bus isolation disconnecting link and one end of a second bus side grounding disconnecting link, the other end of the second I bus isolation disconnecting link is connected with a I bus unit, the other end of the second II bus isolation disconnecting link is connected with a II bus unit, and the other end of the second bus side grounding switch is grounded; the circuit between the second main transformer high-voltage side isolation switch and the second circuit breaker is grounded through the second main transformer high-voltage side grounding switch, and the second current transformer is installed on the circuit between the second main transformer high-voltage side isolation switch and the second circuit breaker.
The line 1 spacing unit comprises a first line side isolation disconnecting link, a first line side grounding disconnecting link, a third current transformer, a third circuit breaker, a third I bus isolation disconnecting link, a third II bus isolation disconnecting link and a third bus side grounding disconnecting link;
the other end of the third circuit breaker is connected with one end of a third I bus isolation disconnecting link, one end of a third II bus isolation disconnecting link and one end of a third bus side grounding disconnecting link, the other end of the third I bus isolation disconnecting link is connected with a I bus unit, the other end of the third II bus isolation disconnecting link is connected with a II bus unit, and the other end of the third bus side grounding disconnecting link is grounded;
the third current transformer is arranged on a line between the first line side isolation switch and the third circuit breaker.
The line 2 spacing unit comprises a second line side isolation disconnecting link, a second line side grounding disconnecting link, a fourth current transformer, a fourth circuit breaker, a fourth I bus isolation disconnecting link, a fourth II bus isolation disconnecting link and a fourth bus side grounding disconnecting link;
the one end of second line side isolation switch and second line side ground connection switch and the one end of fourth circuit breaker are connected, the other end ground connection of second line side ground connection switch, the other end of fourth circuit breaker and the one end of the female isolation switch of fourth I, the one end of the female isolation switch of fourth II and the one end of the female ground connection switch of fourth bus side are connected, the other end ground connection of fourth bus side ground connection switch, the other end of the female isolation switch of fourth I is connected with I mother's unit, the other end of the female isolation switch of fourth II is connected with II mother's unit, fourth current transformer installs on the circuit between second line side isolation switch and the fourth circuit breaker.
The bus-tie spacing unit comprises a fifth current transformer, a fifth circuit breaker, a fifth I bus isolation disconnecting link and a fifth II bus isolation disconnecting link;
the I female unit is connected with the II female unit through a fifth I female isolation disconnecting link, a fifth circuit breaker and a fifth II female isolation disconnecting link, and a fifth current transformer is installed on a line between the fifth I female isolation disconnecting link and the fifth circuit breaker.
The invention relates to a method for checking bus differential protection polarity of a double-bus system in a wiring mode, which comprises the following steps of:
1) the generator 1 has a whole set of starting conditions, short circuit and no-load tests of the generator 1 and the main transformer 1 are completed, and related protection of the generator-transformer set protection device is correctly put into use;
2) the No. 1 generator interval unit and the No. 2 generator interval unit are connected into a female unit I, the circuit 1 interval unit and the circuit 2 interval unit are connected into a female unit II, the female unit I is connected with the female unit II, and a first female isolation disconnecting link I, a first main transformer high-voltage side isolation disconnecting link and a first circuit breaker are located at switch-on positions; the method comprises the following steps that a first main transformer high-voltage side grounding disconnecting link, a first bus side grounding disconnecting link and a first II bus isolation disconnecting link are located at disconnecting positions; the second I main transformer high-voltage side isolation disconnecting link, the first main transformer high-voltage side grounding disconnecting link and the second circuit breaker are positioned at switch-on positions, and the second main transformer high-voltage side isolation disconnecting link, the second II main transformer high-voltage side isolation disconnecting link and the second bus side grounding disconnecting link are positioned at switch-off positions; a third II female isolation disconnecting link, a first line side grounding disconnecting link and a third circuit breaker are positioned at switch-on positions; the third I bus isolation disconnecting link, the first bus side isolation disconnecting link and the third bus side grounding disconnecting link are positioned at switch-separating positions; a fourth II female isolation disconnecting link, a second line side grounding disconnecting link and a fourth circuit breaker are positioned at switch-on positions; a fourth I bus isolation disconnecting link, a second bus side isolation disconnecting link and a fourth bus side grounding disconnecting link are positioned at switch-separating positions; placing a fifth I female isolation disconnecting link, a fifth II female isolation disconnecting link and a fifth circuit breaker at switch-on positions;
3) starting the No. 1 generator, enabling the No. 1 generator to carry out current rise, measuring the current on the high-voltage side of the No. 1 main transformer by using a pincerlike phase meter, and stopping the current rise of the No. 1 generator when the current on the high-voltage side of the No. 1 main transformer reaches 0.2A;
4) checking whether the amplitude and the phase of the three-phase current at the high-voltage side of the No. 1 main transformer are correct by using a pincerlike phase meter, checking whether the amplitude and the phase of the samples of all the protection measuring devices connected into the three-phase current at the high-voltage side of the No. 1 main transformer are correct, and turning to the step 6) when the amplitude and the phase of the three-phase current at the high-voltage side of the No. 1 main transformer are correct and the amplitude and the phase of the samples of all the protection measuring devices connected into the three-phase current at the high-; otherwise, turning to the step 5);
5) reducing the current of the No. 1 generator to zero, exiting the No. 1 generator, carrying out defect inspection on the current transformer secondary circuit with incorrect sampling amplitude and phase of the three-phase current at the high-voltage side of the No. 1 main transformer, then processing the defect, and then turning to the step 3);
6) checking whether the amplitudes and phases of the high-voltage side of the No. 2 main transformer, the line 1, the line 2 and the three-phase current of the bus coupler are correct by using a pincerlike phase table, checking whether the amplitudes and phases sampled by all protection measuring devices connected to the high-voltage side of the No. 2 main transformer T2, the line 1, the line 2 and the three-phase current of the bus coupler are correct, checking whether the differential current of each branch of the bus coupler protection device is correct, when the amplitudes and phases of the high-voltage side of the No. 2 main transformer T2, the line 1, the line 2 and the three-phase current of the bus coupler are correct, checking whether the amplitudes and phases sampled by all protection measuring devices connected to the high-voltage side of the No. 2 main transformer, the line 1, the line 2 and the three-phase current of the bus coupler are correct, and turning to the step 8;
7) reducing the current of the generator No. 1 to zero, withdrawing the generator No. 1, carrying out defect inspection on the high-voltage side of the main transformer No. 2, the circuit 1, the circuit 2 and the secondary circuit of the current transformer with incorrect sampling amplitude and phase of the three-phase current of the bus coupler, eliminating the defects, and then turning to the step 3);
8) and the current of the No. 1 generator is reduced to zero, the No. 1 generator is withdrawn, the bus differential protection is correctly put into use, the system is recovered to the initial state, and the check of the bus differential protection polarity in the double-bus system wiring mode is completed.
The invention has the following beneficial effects:
the invention relates to a system and a method for checking the bus differential protection polarity of a double-bus system in a wiring mode, wherein during specific operation, a No. 2 generator spacing unit, a line 1 spacing unit, a line 2 spacing unit and a bus-coupled spacing unit are all connected into a I bus unit and a II bus unit, then current transformers of other spacing units except the No. 1 generator spacing unit and the bus-coupled spacing unit are in short circuit grounding from a bus side, a No. 1 generator is used as a current source to carry out through current on all the spacing units, so that the checking of the bus differential protection polarity of the double-bus system is checked, the load current can be used for checking the correctness of the bus differential protection polarity before the double-bus system is powered on, the bus differential protection can be put into use after the checking is finished, the subsequent unit grid-connected test time is saved, and the safety and.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
Wherein G13 is a first main transformer high-voltage side isolation switch, G131 is a first main transformer high-voltage side grounding switch, CT1 is a first current transformer, DL1 is a first circuit breaker, G11 is a first I-bus isolation switch, G12 is a first II-bus isolation switch, G111 is a first bus side grounding switch, G23 is a second main transformer high-voltage side isolation switch, G231 is a second main transformer high-voltage side grounding switch, CT2 is a second current transformer, DL2 is a second circuit breaker, G21 is a second I-bus isolation switch, G22 is a second II-bus isolation switch, G211 is a second bus side grounding switch, G33 is a first line side isolation switch, G331 is a first line side grounding switch, CT3 is a third current transformer, DL3 is a third circuit breaker, G31 is a third I-bus isolation switch, G32 is a third bus isolation switch, G43 is a third line side grounding switch, G36311 is a second line side isolation switch, CT4 is a fourth current transformer, DL4 is a fourth circuit breaker, G41 is a fourth I-bus isolation switch, G42 is a fourth II-bus isolation switch, G411 is a fourth bus-side grounding switch, CT5 is a fifth current transformer, DL5 is a fifth circuit breaker, G51 is a fifth I-bus isolation switch, G52 is a fifth II-bus isolation switch, W1 is a generator No. 1, T1 is a main transformer No. 1, W2 is a generator No. 2, and T2 is a main transformer No. 2.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for checking the bus differential protection polarity in the double-bus system connection mode includes a bus unit I, a generator unit 1, a generator interval unit 2, a line 1 interval unit, a line 2 interval unit, a bus coupling interval unit and a bus unit II; the I female unit is connected with the 1 # generator unit, the 2 # generator spacing unit, the 1 circuit spacing unit, the 2 circuit spacing unit and the female connection spacing unit, and the II female unit is connected with the 1 # generator unit, the 2 # generator spacing unit, the 1 circuit spacing unit, the 2 circuit spacing unit and the female connection spacing unit.
The No. 1 power generator unit comprises a No. 1 power generator W1, a No. 1 main transformer T1, a first main transformer high-voltage side isolation disconnecting link G13, a first main transformer high-voltage side grounding disconnecting link G131, a first current transformer CT1, a first circuit breaker DL1, a first I female isolation disconnecting link G11, a first II female isolation disconnecting link G12 and a first bus side grounding disconnecting link G111; no. 1 generator W1 is connected with one end of a first circuit breaker DL1 through a No. 1 main transformer T1 and a first main transformer high-voltage side isolation disconnecting link G13, the other end of the first circuit breaker DL1 is connected with one end of a first I female isolation disconnecting link G11, one end of a first II female isolation disconnecting link G12 and one end of a first bus side grounding disconnecting link G111, the other end of the first I female isolation disconnecting link G11 is connected with a I female unit, the other end of the first II female isolation disconnecting link G12 is connected with a II female unit, the other end of the first bus side grounding disconnecting link G111 is grounded, a line between a first main transformer high-voltage side isolation disconnecting link G13 and the first circuit breaker DL1 is grounded through a first main transformer high-voltage side grounding disconnecting link G131, and a first current transformer CT1 is installed on the line between the first main transformer high-voltage side isolation disconnecting link G13 and the first circuit breaker DL 1.
The No. 2 generator spacing unit comprises a No. 2 generator W2, a No. 2 main transformer T2, a second main transformer high-voltage side isolation disconnecting link G23, a second main transformer high-voltage side grounding disconnecting link G231, a second current transformer CT2, a second circuit breaker DL2, a second I female isolation disconnecting link G21, a second II female isolation disconnecting link G22 and a second bus side grounding disconnecting link G211; the No. 2 generator W2 is connected with one end of a second circuit breaker DL2 through a No. 2 main transformer T2 and a second main transformer high-voltage side isolation disconnecting link G23, the other end of the second circuit breaker DL2 is connected with one end of a second I female isolation disconnecting link G21, one end of a second II female isolation disconnecting link G22 and one end of a second bus side grounding disconnecting link G211, the other end of the second I female isolation disconnecting link G21 is connected with a I female unit, the other end of the second II female isolation disconnecting link G22 is connected with a II female unit, and the other end of the second bus side grounding disconnecting link G211 is grounded; a line between the second main transformer high-voltage side isolation switch G23 and the second circuit breaker DL2 is grounded through a second main transformer high-voltage side grounding switch G231, and a second current transformer CT2 is installed on the line between the second main transformer high-voltage side isolation switch G23 and the second circuit breaker DL 2.
The line 1 spacing unit comprises a first line side isolation disconnecting link G33, a first line side grounding disconnecting link G331, a third current transformer CT3, a third circuit breaker DL3, a third I female isolation disconnecting link G31, a third II female isolation disconnecting link G32 and a third bus side grounding disconnecting link G311; the first line side isolation disconnecting link G33 is connected with one end of a third circuit breaker DL3 and one end of a first line side grounding disconnecting link G331, the other end of the first line side grounding disconnecting link G331 is grounded, the other end of a third circuit breaker DL3 is connected with one end of a third I female isolation disconnecting link G31, one end of a third II female isolation disconnecting link G32 and one end of a third bus side grounding disconnecting link G311, the other end of the third I female isolation disconnecting link G31 is connected with a I female unit, the other end of a third II female isolation disconnecting link G32 is connected with a II female unit, and the other end of the third bus side grounding disconnecting link G311 is grounded; the current transformer CT3 is installed on the line between the first line side isolation switch G33 and the third breaker DL 3.
The line 2 spacing unit comprises a second line side isolation disconnecting link G43, a second line side grounding disconnecting link G431, a fourth current transformer CT4, a fourth circuit breaker DL4, a fourth I female isolation disconnecting link G41, a fourth II female isolation disconnecting link G42 and a fourth bus side grounding disconnecting link G411; the second line side isolation disconnecting link G43 is connected with one end of a second line side grounding disconnecting link G431 and one end of a fourth circuit breaker DL4, the other end of the second line side grounding disconnecting link G431 is grounded, the other end of a fourth circuit breaker DL4 is connected with one end of a fourth I female isolation disconnecting link G41, one end of a fourth II female isolation disconnecting link G42 and one end of a fourth bus side grounding disconnecting link G411, the other end of the fourth bus side grounding disconnecting link G411 is grounded, the other end of a fourth I female isolation disconnecting link G41 is connected with a I female unit, the other end of a fourth II female isolation disconnecting link G42 is connected with a II female unit, and a fourth current transformer CT4 is installed on a line between the second line side isolation disconnecting link G43 and the fourth circuit breaker DL 4.
The bus-coupled interval unit comprises a fifth current transformer CT5, a fifth circuit breaker DL5, a fifth I bus isolation disconnecting link G51 and a fifth II bus isolation disconnecting link G52; the I mother unit is connected with the II mother unit through a fifth I mother isolating disconnecting switch G51, a fifth circuit breaker DL5 and a fifth II mother isolating switch G52, and a fifth current transformer CT5 is installed on a line between the fifth I mother isolating switch G51 and the fifth circuit breaker DL 5.
Referring to fig. 2, the method for checking the bus differential protection polarity in the double-bus system connection mode according to the present invention includes the following steps:
1) the generator W1 No. 1 has a whole set of starting conditions, short-circuit and no-load tests of the generator W1 No. 1 and the main transformer T1 No. 1 are completed, and related protection of the generator-transformer set protection device is correctly put into use;
2) the No. 1 generator interval unit and the No. 2 generator interval unit are connected into the I mother unit, the line 1 interval unit and the line 2 interval unit are connected into the II mother unit, the I mother unit is connected with the II mother unit, and a first I mother isolation disconnecting link G11, a first main transformer high-voltage side isolation disconnecting link G13 and a first circuit breaker DL1 are positioned at switch-on positions; placing a first main transformer high-voltage side grounding disconnecting link G131, a first bus side grounding disconnecting link G111 and a first II main isolation disconnecting link G12 at a disconnecting position; the second I main isolation disconnecting link G21, the first main transformer high-voltage side grounding disconnecting link G131 and the second circuit breaker DL2 are located at switching-on positions, and the second main transformer high-voltage side isolation disconnecting link G23, the second II main isolation disconnecting link G22 and the second bus side grounding disconnecting link G211 are located at switching-off positions; placing a third II female isolation switch G32, a first line side grounding switch G331 and a third breaker DL3 in a switching-on position; placing a third I-bus isolation disconnecting link G31, a first bus-side isolation disconnecting link G33 and a third bus-side grounding disconnecting link G311 in a disconnecting position; putting a fourth II female disconnecting switch G42, a second line side grounding switch G431 and a fourth breaker DL4 in a switching-on position; placing a fourth I-bus isolation disconnecting link G41, a second bus-side isolation disconnecting link G43 and a fourth bus-side grounding disconnecting link G411 in a disconnecting position; the fifth I female isolating switch G51, the fifth II female isolating switch G52 and the fifth breaker DL5 are in the switching-on position;
3) starting the No. 1 generator W1, performing current rise on the No. 1 generator W1, measuring the current on the high-voltage side of the No. 1 main transformer T1 by using a pincerlike phase table, and stopping the current rise of the No. 1 generator W1 when the current on the high-voltage side of the No. 1 main transformer T1 reaches 0.2A;
4) checking whether the amplitude and the phase of the high-voltage side three-phase current of the No. 1 main transformer T1 are correct by using a pincerlike phase meter, checking whether the amplitude and the phase of all protection measuring devices connected with the high-voltage side three-phase current of the No. 1 main transformer, such as a bus bar difference protection device, a main transformer protection device, a fault recorder and the like, are correct, and when the amplitude and the phase of the high-voltage side three-phase current of the No. 1 main transformer T1 are correct and the amplitude and the phase of all protection measuring devices connected with the high-voltage side three-phase current of the No. 1 main transformer are correct, turning; otherwise, turning to the step 5);
5) reducing the current of the No. 1 generator W1 to zero, exiting the No. 1 generator W1, carrying out defect inspection on the secondary circuit of the current transformer with incorrect sampling amplitude and phase of the three-phase current at the high-voltage side of the No. 1 main transformer T1, processing the defects, and then turning to the step 3);
6) checking whether the amplitudes and phases of the high-voltage side of the No. 2 main transformer T2, the line 1, the line 2 and the three-phase current of the bus coupler are correct by using a pincerlike phase meter, checking whether the amplitudes and phases of all protection measuring devices connected to the high-voltage side of the No. 2 main transformer T2, the line 1, the line 2 and the three-phase current of the bus coupler, such as a bus differential protection device, a line protection device, a bus coupler protection cabinet, a fault recorder and the like, are correct, checking whether the differential currents of all branches of the bus differential protection device are correct, when the amplitudes and phases of the high-voltage side of the No. 2 main transformer T2, the circuit 1, the circuit 2 and the three-phase current of the bus coupler are correct, the amplitudes and phases of all protection and measurement devices connected to the high-voltage side of the No. 2 main transformer T2, the circuit 1, the circuit 2 and the three-phase current of the bus coupler are correct, and the differential currents of all branches of the bus differential protection device are correct, the step 8) is carried out, and otherwise, the step 7) is carried out;
7) reducing the current of the No. 1 generator W1 to zero, exiting the No. 1 generator W1, carrying out defect inspection on the high-voltage side of the No. 2 main transformer T2, the line 1, the line 2 and the secondary circuit of the current transformer with incorrect sampling amplitude and phase of the three-phase current of the bus coupler, eliminating defects, and then turning to the step 3);
8) the current of the generator W1 No. 1 is reduced to zero, the generator W1 No. 1 is quitted, the bus bar protection is correctly put into use, the system is restored to the initial state, and the check of the bus bar protection polarity in the double-bus system wiring mode is completed.
The invention can realize the checking of the bus differential protection polarity in the double-bus system wiring mode, and can also carry out the bus differential protection polarity checking on other similar system wiring mode units, for example, the backup converter is powered by other systems and the bus system is not powered (a single-bus system, 3/2 wiring system and the like).
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. A double-bus system wiring mode bus differential protection polarity verification system is characterized by comprising a bus unit I, a generator unit No. 1, a generator interval unit No. 2, a line 1 interval unit, a line 2 interval unit, a bus coupling interval unit and a bus unit II;
the I female unit is connected with the 1 # generator unit, the 2 # generator spacing unit, the 1 circuit spacing unit, the 2 circuit spacing unit and the female connection spacing unit, and the II female unit is connected with the 1 # generator unit, the 2 # generator spacing unit, the 1 circuit spacing unit, the 2 circuit spacing unit and the female connection spacing unit.
2. The double-bus system wiring mode bus differential protection polarity verification system of claim 1, wherein the No. 1 generator unit comprises a No. 1 generator (W1), a No. 1 main transformer (T1), a first main transformer high-voltage side isolation disconnecting link (G13), a first main transformer high-voltage side grounding disconnecting link (G131), a first current transformer (CT1), a first circuit breaker (DL1), a first I bus isolation disconnecting link (G11), a first II bus isolation disconnecting link (G12) and a first bus side grounding disconnecting link (G111);
the No. 1 generator (W1) is connected with one end of a first circuit breaker (DL1) through a No. 1 main transformer (T1) and a first main transformer high-voltage side isolation disconnecting link (G13), the other end of the first circuit breaker (DL1) is connected with one end of a first I mother isolation disconnecting link (G11), one end of a first II female isolation disconnecting link (G12) is connected with one end of a first bus side grounding disconnecting link (G111), the other end of the first I female isolation disconnecting link (G11) is connected with a first I female unit, the other end of the first II female isolation disconnecting link (G12) is connected with a second II female unit, the other end of the first bus side grounding disconnecting link (G111) is grounded, a circuit between the first main transformer high-voltage side isolation disconnecting link (G13) and a first circuit breaker (DL1) is grounded through a first main transformer high-voltage side grounding disconnecting link (G131), and a first current transformer (CT1) is installed on a circuit between the first main transformer high-voltage side isolation disconnecting link (G13) and the first circuit breaker (DL 1).
3. The double-bus system connection mode bus differential protection polarity verification system of claim 2, wherein the No. 2 generator interval unit comprises a No. 2 generator (W2), a No. 2 main transformer (T2), a second main transformer high-voltage side isolation disconnecting link (G23), a second main transformer high-voltage side grounding disconnecting link (G231), a second current transformer (CT2), a second circuit breaker (DL2), a second I bus isolation disconnecting link (G21), a second II bus isolation disconnecting link (G22) and a second bus side grounding disconnecting link (G211);
the No. 2 generator (W2) is connected with one end of a second circuit breaker (DL2) through a No. 2 main transformer (T2) and a second main transformer high-voltage side isolation disconnecting link (G23), the other end of the second circuit breaker (DL2) is connected with one end of a second I bus isolation disconnecting link (G21), one end of a second II bus isolation disconnecting link (G22) and one end of a second bus side grounding disconnecting link (G211), the other end of the second I bus isolation disconnecting link (G21) is connected with an I bus unit, the other end of the second II bus isolation disconnecting link (G22) is connected with a II bus unit, and the other end of the second bus side grounding disconnecting link (G211) is grounded; the circuit between the second main transformer high-voltage side isolation disconnecting link (G23) and the second circuit breaker (DL2) is grounded through a second main transformer high-voltage side grounding disconnecting link (G231), and a second current transformer (CT2) is installed on the circuit between the second main transformer high-voltage side isolation disconnecting link (G23) and the second circuit breaker (DL 2).
4. The system for checking the polarity of bus differential protection in a double-bus system connection manner according to claim 3, wherein the line 1 interval unit comprises a first line-side isolation switch (G33), a first line-side grounding switch (G331), a third current transformer (CT3), a third circuit breaker (DL3), a third I bus isolation switch (G31), a third II bus isolation switch (G32) and a third bus-side grounding switch (G311);
the first line side isolation disconnecting link (G33) is connected with one end of a third breaker (DL3) and one end of a first line side grounding disconnecting link (G331), the other end of the first line side grounding disconnecting link (G331) is grounded, the other end of a third breaker (DL3) is connected with one end of a third I mother isolation disconnecting link (G31), one end of a third II mother isolation disconnecting link (G32) and one end of a third bus side grounding disconnecting link (G311), the other end of the third I mother isolation disconnecting link (G31) is connected with a I mother unit, the other end of the third II mother isolation disconnecting link (G32) is connected with a II mother unit, and the other end of the third bus side grounding disconnecting link (G311) is grounded;
a third current transformer (CT3) is mounted on the line between the first line side isolation switch (G33) and the third breaker (DL 3).
5. The system for verifying the bus differential protection polarity of the double-bus system in the wiring manner, according to claim 4, wherein the line 2 partition unit comprises a second line-side isolation switch (G43), a second line-side grounding switch (G431), a fourth current transformer (CT4), a fourth circuit breaker (DL4), a fourth I bus isolation switch (G41), a fourth II bus isolation switch (G42) and a fourth bus-side grounding switch (G411);
the second line side isolation disconnecting link (G43) is connected with one end of a second line side grounding disconnecting link (G431) and one end of a fourth circuit breaker (DL4), the other end of the second line side grounding disconnecting link (G431) is grounded, the other end of a fourth circuit breaker (DL4) is connected with one end of a fourth I mother isolation disconnecting link (G41), one end of a fourth II mother isolation disconnecting link (G42) and one end of a fourth bus side grounding disconnecting link (G411), the other end of the fourth bus side grounding disconnecting link (G411) is grounded, the other end of a fourth I mother isolation disconnecting link (G41) is connected with the I mother unit, the other end of a fourth II mother isolation disconnecting link (G42) is connected with the II mother unit, and a fourth current transformer (CT4) is installed on a line between the second line side isolation disconnecting link (G43) and the fourth circuit breaker (DL 4).
6. The double-bus system wiring mode bus differential protection polarity verification system as claimed in claim 5, wherein the bus tie interval unit comprises a fifth current transformer (CT5), a fifth circuit breaker (DL5), a fifth I bus isolation disconnecting link (G51) and a fifth II bus isolation disconnecting link (G52);
the I mother unit is connected with the II mother unit through a fifth I mother isolation disconnecting link (G51), a fifth breaker (DL5) and a fifth II mother isolation disconnecting link (G52), and a fifth current transformer (CT5) is installed on a line between the fifth I mother isolation disconnecting link (G51) and the fifth breaker (DL 5).
7. A method for checking the bus differential protection polarity of a double-bus system in a wiring mode is characterized in that the method is based on the checking system of the bus differential protection polarity of the double-bus system in the wiring mode of claim 6 and comprises the following steps:
1) the generator 1 (W1) has a whole set of starting conditions, short-circuit and no-load tests of the generator 1 (W1) and the main transformer 1 (T1) are completed, and related protection of the generator-transformer group protection device is correctly put into use;
2) the generator interval unit No. 1 and the generator interval unit No. 2 are connected into the female unit I, the circuit interval unit No. 1 and the circuit interval unit No. 2 are connected into the female unit II, the female unit I is connected with the female unit II, and a first female isolation disconnecting link I (G11), a first main transformer high-voltage side isolation disconnecting link G13 and a first circuit breaker DL1 are located at switch-on positions; placing a first main transformer high-voltage side grounding disconnecting link (G131), a first bus side grounding disconnecting link (G111) and a first II bus isolation disconnecting link (G12) at a disconnecting position; a second I main isolation disconnecting link (G21), a first main transformer high-voltage side grounding disconnecting link (G131) and a second circuit breaker (DL2) are located at switch-on positions, and a second main transformer high-voltage side isolation disconnecting link (G23), a second II main isolation disconnecting link (G22) and a second bus side grounding disconnecting link (G211) are located at switch-off positions; placing a third II female isolation switch (G32), a first line side grounding switch (G331) and a third breaker (DL3) in a switch-on position; placing a third busbar isolation disconnecting link (G31), a first line side isolation disconnecting link (G33) and a third busbar side grounding disconnecting link (G311) at a disconnecting position; placing a fourth II female isolation switch (G42), a second line side grounding switch (G431), and a fourth circuit breaker (DL4) in a closed position; placing a fourth busbar-side isolation switch (G41), a second line-side isolation switch (G43) and a fourth busbar-side grounding switch (G411) in a disconnecting position; placing a fifth I female isolation switch (G51), a fifth II female isolation switch (G52), and a fifth circuit breaker (DL5) in a closed position;
3) starting a No. 1 generator (W1), enabling the No. 1 generator (W1) to flow up, measuring the current on the high-voltage side of a No. 1 main transformer (T1) by using a pincerlike phase table, and stopping the flow up of the No. 1 generator (W1) when the current on the high-voltage side of the No. 1 main transformer (T1) reaches 0.2A;
4) checking whether the amplitude and the phase of the high-voltage side three-phase current of the No. 1 main transformer (T1) are correct by using a pincerlike phase table, checking whether the amplitude and the phase of all protection measuring devices connected into the high-voltage side three-phase current of the No. 1 main transformer are correct, and when the amplitude and the phase of the high-voltage side three-phase current of the No. 1 main transformer (T1) are correct and the amplitude and the phase of all protection measuring devices connected into the high-voltage side three-phase current of the No. 1 main transformer are correct, turning to the step 6); otherwise, turning to the step 5);
5) reducing the current of the No. 1 generator (W1) to zero, exiting the No. 1 generator (W1), carrying out defect inspection on a current transformer secondary circuit with incorrect sampling amplitude and phase of the three-phase current at the high-voltage side of the No. 1 main transformer (T1), processing the defects, and then turning to the step 3);
6) checking whether the amplitudes and phases of the high-voltage side of a No. 2 main transformer (T2), the line 1, the line 2 and the bus-bar three-phase current are correct by using a pincerlike phase table, checking whether the amplitudes and phases of all protection and measurement devices connected to the high-voltage side of the No. 2 main transformer (T2), the line 1, the line 2 and the bus-bar three-phase current are correct, checking whether the differential currents of all branches of the bus-bar protection device are correct, when the amplitudes and phases of the high-voltage side of the No. 2 main transformer (T2), the line 1, the line 2 and the bus-bar three-phase current are correct, checking that the amplitudes and phases of all protection and measurement devices connected to the high-voltage side of the No. 2 main transformer (T2), the line 1, the line 2 and the bus-bar three-phase current are correct, and turning to a step 8 if the differential currents of all branches;
7) reducing the current of the No. 1 generator (W1) to zero, exiting the No. 1 generator (W1), carrying out defect inspection on the high-voltage side of the No. 2 main transformer (T2), the line 1, the line 2 and the current transformer secondary circuit with incorrect sampling amplitude and phase of the three-phase current of the bus coupler, eliminating defects, and then turning to the step 3);
8) and the current of the No. 1 generator (W1) is reduced to zero, the No. 1 generator (W1) is quitted, the bus bar protection is correctly put into use, the system is recovered to the initial state, and the check of the bus bar protection polarity in the double-bus system wiring mode is completed.
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| CN112965021A (en) * | 2021-02-05 | 2021-06-15 | 西安热工研究院有限公司 | Transformer substation bus PT voltage-passing system and method |
| CN113156340A (en) * | 2021-04-16 | 2021-07-23 | 西安热工研究院有限公司 | Calibration system and method for PT switching secondary circuit of double-bus wiring mode system |
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