CN113325221A - Method for substation bus power transmission and power supply phase checking - Google Patents
Method for substation bus power transmission and power supply phase checking Download PDFInfo
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- CN113325221A CN113325221A CN202110751774.8A CN202110751774A CN113325221A CN 113325221 A CN113325221 A CN 113325221A CN 202110751774 A CN202110751774 A CN 202110751774A CN 113325221 A CN113325221 A CN 113325221A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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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
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a method for bus power transmission and power supply phase checking of a transformer substation, which is used for a transformer substation power supply and distribution system and comprises the following steps: checking that the secondary voltage air switches of the first and second section buses PT are all in a disconnection position, switching on the first and second section bus coupling circuit breakers, switching on the circuit breaker between the No. 1 main transformer and the first section bus, supplying power to the first and second section buses, and detecting whether the first and second section buses are normal; if the bus is normal, closing the secondary voltage of the first-section bus PT and the second-section bus PT, opening the bus, respectively detecting whether the three-phase voltage values and the phases of the first-section bus PT and the second-section bus PT are correct, respectively performing phase checking on the three-phase voltages of the secondary sides of the first-section bus PT and the second-section bus PT, and testing whether the phases are correct; if yes, the bus tie circuit breaker is disconnected, the circuit breaker between the No. 2 main transformer and the second-section bus is connected, the second-section bus is powered, the phase of the three-phase voltage of the PT secondary side of the first-section bus and the second-section bus is verified respectively, and whether the phase is correct is tested. The method can ensure the safety of the bus power transmission switching operation of the transformer substation and the accuracy of the power supply voltage phase checking.
Description
Technical Field
The invention relates to the technical field of high-voltage equipment maintenance, in particular to a method for bus power transmission and power supply phase checking of a transformer substation.
Background
In the prior art, in order to improve reliability and stability of power supply, an incoming line power supply of a large-scale substation is generally provided with two or more power supply lines for supplying power. When one of the power supply lines is in maintenance or has a fault, the other power supply lines can supply power, so that power can be supplied to users. For a three-phase power supply system, fixed phase differences exist among three phases, when two or more power supply lines are in parallel or loop closing treatment, if the phases or phase sequences are different, a short-circuit accident is caused, huge current is generated in the circuit, abnormal operation of three-phase equipment on a user side is easily caused, and a generator or electrical equipment is damaged.
Therefore, after the transformer substation is newly built, equipment such as an incoming line power line of the transformer substation needs to be subjected to power transmission and power supply phase checking, and the safety of power transmission switching operation and accurate phase checking of bus equipment need to be determined, so that the important role in power transmission and later stable operation of the transformer substation equipment is played.
Disclosure of Invention
In order to at least partially solve the technical problems in the prior art, the invention provides a substation bus power transmission and power supply phase checking method.
The technical scheme of the invention is as follows:
the method is used for a transformer substation bus power transmission and power supply phase checking system, the transformer substation bus power supply and distribution system comprises a first section of bus and a second section of bus, the first section of bus is connected with a No. 1 main transformer and a first section of bus PT, the second section of bus is connected with a No. 2 main transformer and a second section of bus PT, the first section of bus and the second section of bus are connected with each other through a bus coupler, and the method comprises the following steps:
step 1: setting the secondary voltage idle switch of the first section of bus PT and the second section of bus PT to be in a disconnected state, electrically connecting the first section of bus and the second section of bus through a bus coupler, closing a circuit breaker between a No. 1 main transformer and the first section of bus, supplying power to the first section of bus and the second section of bus, detecting whether the first section of bus and the second section of bus are normal, and if so, executing the next step;
step 2: closing the secondary voltage of the first-section bus PT, opening the bus in an air mode, detecting whether the three-phase voltage value and the phase of the first-section bus are correct or not, and if yes, executing the next step;
and step 3: closing the secondary voltage of the II-section bus PT, opening the bus in an air mode, detecting whether the three-phase voltage value and the phase of the II-section bus are correct or not, and if yes, executing the next step;
and 4, step 4: respectively carrying out phase checking on the PT secondary side three-phase voltages of the first-section bus and the second-section bus, testing whether the phases are correct or not, and if so, executing the next step;
and 5: disconnecting the secondary voltage of the II-section bus PT, testing whether the three-phase voltage indication of a voltmeter on a handcart control cabinet door of the bus tie circuit breaker is normal or not, and if so, executing the next step;
step 6: switching on a secondary voltage of a second-section bus PT, disconnecting a bus coupler circuit breaker, switching on a circuit breaker between a No. 2 main transformer and the second-section bus, supplying power to the second-section bus, performing phase checking on the PT secondary side three-phase voltages of the first-section bus and the second-section bus respectively, testing whether the phase is correct, and if so, executing the next step;
and 7: when the phases are checked and tested to be correct, the three-phase power supply voltage phases of the primary system of the I section of bus and the II section of bus can be determined to be the same.
Optionally, in the step 1, the method further includes:
setting secondary voltage parallel conversion handles of the first section of bus PT and the second section of bus PT at a splitting position; respectively arranging the handcart cabinets of the first section of bus PT and the second section of bus PT at working positions; the handcart cabinet of the bus coupler is arranged at a working position.
Optionally, in the step 1, the method further includes:
when supplying power to I section generating line and II section generating lines, strike 3 times in succession to whether I section generating line and II section generating lines are normal is detected, if normal, then carry out next step.
Optionally, in the step 1, the method further includes:
and detecting whether the three-phase voltage value and the open delta voltage of the secondary voltage air-break power supply side of the I section of bus PT are normal or not, and if so, executing the next step.
Optionally, the substation power supply and distribution system includes a protection device of a No. 1 main transformer protection measurement and control screen associated with a No. 1 main transformer, an electric energy meter of a metering screen, and a fault recording management system and a frequency-voltage emergency control device associated with a first-segment bus, in step 2, the substation power supply and distribution system further includes:
checking whether the three-phase voltage value and the phase are correct or not on a protection device of a No. 1 main transformer protection measurement and control screen, and checking whether the three-phase voltage indication is normal or not on a No. 1 main transformer electric energy meter of a metering screen; whether the three-phase voltage value and the phase of the I-section bus are correct or not is checked in the fault recording management system, whether the three-phase voltage value and the phase of the I-section bus are correct or not is checked on the frequency-voltage emergency control device, and if yes, the next step is executed.
Optionally, the substation power supply and distribution system includes a protection device of a No. 2 main transformer protection measurement and control screen associated with a No. 2 main transformer, an electric energy meter of a metering screen, and a fault recording management system and a frequency-voltage emergency control device associated with a second-segment bus, in step 3, the substation power supply and distribution system further includes:
checking whether the three-phase voltage value and the phase are correct or not on a protection device of a No. 2 main transformer protection measurement and control screen, and checking whether the three-phase voltage indication is normal or not on a No. 2 main transformer electric energy meter of a metering screen; and checking whether the three-phase voltage value and the phase of the second section of bus are correct or not in the fault recording management system, checking whether the three-phase voltage value and the phase of the second section of bus are correct or not on the frequency-voltage emergency control device, and executing the next step if the three-phase voltage value and the phase of the second section of bus are correct or not.
Optionally, in the step 5, the method further includes:
the PT secondary voltage parallel conversion handle on the control cabinet door of the bus-coupled isolation handcart is rotated to a parallel position from a splitting position, whether three-phase voltage indication is normal or not is checked on a voltmeter on the control cabinet door of the bus-coupled circuit breaker handcart, and if yes, the next step is executed.
Optionally, in the step 5, the method further includes:
the parallel test device for the PT secondary voltage of the first-section bus and the second-section bus works normally, the parallel voltage conversion handle is rotated to a splitting position from a parallel position, and on a voltmeter on a handcart control cabinet door of the bus tie circuit breaker, whether three-phase voltage indication is zero or not is checked.
The technical scheme of the invention has the following main advantages:
the method for the bus power transmission and the power phase checking of the transformer substation can be used for the power voltage phase checking of a newly-built transformer substation, and effectively ensures the safety of the bus power transmission switching operation of the newly-built transformer substation and the accuracy of the power voltage phase checking through various tests, so that the transformer substation equipment can be safely and stably operated in the later period.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic block diagram of a substation power supply and distribution system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of bus transmission and power supply phase checking of a substation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, in one embodiment according to the present invention, a substation power supply and distribution system and a method for substation bus power transmission and power supply phase checking of the system are provided.
This transformer substation supplies distribution system includes I section generating line and II section generating lines, and I section generating line is connected with 1 number owner and I section generating line PT, and II section generating lines are connected with 2 numbers owner and II section generating line PT, through female antithetical couplet interconnect between I section generating line and the II section generating line. As shown in figure 1, I section generating line and II section generating lines are 10kV I section generating line and 10kV II section generating line respectively, and 1 number owner becomes the I section generating line power supply of 10kV through 10kV side 1001 circuit breaker hand truck cabinet, and 10kV I section generating line PT 1081 is connected to 10kV I section generating line. No. 2 main become through 10kV side 1002 circuit breaker handcart cabinet for the II section generating lines of 10kV power supply, II section generating lines PT 1082 of 10kV are connected to II section generating lines of 10kV, wherein, 1001 circuit breaker handcart cabinet and 1002 circuit breaker handcart cabinet are inlet wire circuit breaker handcart cabinet. The bus tie comprises a 10kV bus tie breaker cabinet 1100 and a 10kV bus tie isolation cabinet 1100-2, and the electrical connection of a 10kV I-section bus and a 10kV II-section bus can be realized. Illustratively, the coupling groups of the No. 1 main transformer and the No. 2 main transformer of the transformer substation are both YNd 11. In the present embodiment, the switch cabinets are all cart cabinets. It should be noted that, for simplicity, the trolley cabinets of the feeder lines of the 10kV i-section bus and the 10kV ii-section bus are not shown in fig. 1.
In the embodiment, after the construction of a new transformer substation is completed, firstly, 5 times of impact tests are performed on a new main transformer 1 and a new main transformer 2, the new main transformer and the new main transformer are enabled to run in an idle state for 24 hours, then, 10kV I-section buses and 10kV II-section buses are powered on, and in the process of power transmission, the nuclear phase of two paths of power supplies is performed on the secondary voltage sides of the 10kV I-section buses PT and the 10kV II-section buses PT. Hereinafter, the method of power transmission and power supply phasing in the present embodiment will be further described with reference to fig. 2.
As shown in fig. 2, the method for transmitting power to a substation bus and checking the phase of a power supply in the present embodiment includes:
step 1: setting the secondary voltage idle switch of the first section of bus PT and the second section of bus PT to be in a disconnected state, electrically connecting the first section of bus and the second section of bus through a bus coupler, closing a circuit breaker between a No. 1 main transformer and the first section of bus, supplying power to the first section of bus and the second section of bus, detecting whether the first section of bus and the second section of bus are normal, and if so, executing the next step;
specifically, as shown in fig. 2, step 1 includes:
s101: checking that PT secondary voltage air switches of 10kV I and II section buses are in a disconnection position, and checking that a No. 2 main transformer 10kV side 1002 circuit breaker handcart is in a test position; checking that the PT secondary voltage parallel conversion handle of the 10kV I and II section buses is in a splitting position;
s102: shaking a 10kV I-section bus PT 1081 handcart from a test position to a working position;
s103: shaking the 10kV II-section bus PT 1082 handcart from the test position to the working position;
s104: shaking a handcart of a No. 1 main transformer 10kV side 1001 circuit breaker from a test position to a working position;
s105: shaking a 10kV I and II bus coupler 1100 circuit breaker handcart from a test position to a working position;
s106: shaking a 10kV I and II bus-tie 1100-2 isolation handcart from a test position to a working position;
s107: closing a 10kV I and II bus coupler 1100 breaker;
s108: a circuit breaker on a 10kV side 1001 of a No. 1 main transformer is closed, 10kV I and II section buses are powered, impact is performed for 3 times, and whether 10kV I and II section bus equipment is normal or not is checked.
For example, the power transmission condition of 10kV i and ii section buses can be judged by the lighting condition of the incoming call indicator lamp of the 1001 circuit breaker trolley cabinet on the 10kV side of the No. 1 main transformer, and meanwhile, whether abnormal conditions such as abnormal sound or peculiar smell exist in the equipment of the 10kV i and ii section buses in the running process, that is, whether the equipment runs normally, needs to be checked.
It will be appreciated that the test position may be a cold standby position of the electrical apparatus and the operating position may be a hot standby position of the electrical apparatus.
The method also comprises the following steps in the step 1:
s109: measuring whether three-phase voltage and open delta voltage on a PT secondary voltage air-switch power supply side of a 10kV I section bus are normal or not;
illustratively, when the three-phase voltage and the open delta voltage are detected, the values are respectively: the line voltages Uab, Ubc and Uca are all about 105V (for example, 105V +/-3V), the phase voltages Ua, Ub and Uc are all about 60V (for example, 60V +/-3V), and when the open delta voltage is zero, the voltage value is normal.
Thereafter, the method of the present embodiment further includes:
step 2: closing the secondary voltage of the first-section bus PT, opening the bus in an air mode, detecting whether the three-phase voltage value and the phase of the first-section bus are correct or not, and if yes, executing the next step;
specifically, the power supply and distribution system of transformer substation includes the protection device of No. 1 main transformer protection measurement and control screen and the electric energy meter of measurement screen that are correlated with No. 1 main transformer to and the trouble record wave management system and the frequency voltage emergency control device that are correlated with I section generating line, in step 2, still include: checking whether the three-phase voltage value and the phase are correct or not on a protection device of a No. 1 main transformer protection measurement and control screen, and checking whether the three-phase voltage indication is normal or not on a No. 1 main transformer electric energy meter of a metering screen; whether the three-phase voltage value and the phase of the I-section bus are correct or not is checked in the fault recording management system, whether the three-phase voltage value and the phase of the I-section bus are correct or not is checked on the frequency-voltage emergency control device, and if yes, the next step is executed.
As shown in fig. 2, step 2 specifically includes:
s110: closing a PT secondary voltage of a 10kV I section bus and opening the bus in an idle mode, and checking whether the three-phase voltage value and the phase are correct or not on a No. 1 main transformer protection measurement and control screen protection device;
for example, the values of the three-phase voltage value and the phase angle can be checked on the low backup protection device of the main transformer protection measurement and control screen 1, for example, when it is detected that the three-phase voltages Ua, Ub and Uc are all about 60V (e.g., 60V ± 3V), the phase angles are respectively 0 for the a phase, 240 for the b phase and 120 for the c phase, it is indicated that both the voltage value and the phase are correct.
S111: checking whether the three-phase voltage indication is normal or not on an electric energy meter at the 10kV side of a No. 1 main transformer of the metering screen;
illustratively, the numerical values of the three-phase voltages can be checked on a page of the electric energy meter on the 10kV side of the main transformer 1 of the metering screen, for example, when the three-phase voltages Ua, Ub and Uc are all about 60V (e.g. 60V ± 3V), it is indicated that the voltage values are normal.
S112: checking whether the three-phase voltage value and the phase of a 10kV I-section bus are correct or not in a fault recording management system of a dynamic recording device screen of a power system;
illustratively, the three-phase voltage values and the phase angle values of the 10kV i-section bus can be checked on the page of the fault recording management system of the power system dynamic recording device screen, for example, when the three-phase voltages Ua, Ub and Uc are all about 60V (e.g. 60V ± 3V), the zero-sequence voltage 3U is detected to be 3U0If the voltage value is 0V, the voltage value is normal; when the phase angles of the a phase, the b phase and the c phase are respectively detected to be 0 degrees, 240 degrees and 120 degrees, the phase of the three-phase voltage is correct.
S113: checking whether the three-phase voltage value and the phase of a 10kV I-section bus are correct or not in a frequency-voltage emergency control device of a low-cycle low-voltage load shedding screen;
illustratively, the three-phase voltage values and phase angle values of the 10kV I-section bus can be checked on the page of the frequency voltage emergency control device of the low-cycle low-voltage load-reducing screen, for example, when the three-phase voltages Ua, Ub and Uc are all 60V, the zero-sequence voltage is 3U0When the voltage is 0V, the voltage value is normal; when the phase angles of the a phase, the b phase and the c phase are respectively detected to be 0 degrees, 240 degrees and 120 degrees, the phase of the three-phase voltage is correct.
S114: measuring whether three-phase voltage and open delta voltage on the air switch power supply side of the PT secondary voltage of the 10kV II-section bus are normal or not;
illustratively, when the three-phase voltage and the open delta voltage are detected, the values are respectively: the line voltages Ua 'b', Ub 'c', Uc 'a' are all about 105V (e.g. 105V ± 3V); the phase voltages Ua ', Ub ' and Uc ' are all about 60V (for example, 60V +/-3V); when the open triangle voltage is zero, the voltage value is normal.
Thereafter, the method of the present embodiment further includes:
and step 3: closing the secondary voltage of the II-section bus PT, opening the bus in an air mode, detecting whether the three-phase voltage value and the phase of the II-section bus are correct or not, and if yes, executing the next step;
illustratively, the substation power supply and distribution system includes a protection device of a 2 # main transformer protection measurement and control screen associated with a 2 # main transformer and an electric energy meter of a metering screen, and a fault recording management system and a frequency voltage emergency control device associated with a ii-section bus, and in step 3, the substation power supply and distribution system further includes: checking whether the three-phase voltage value and the phase are correct or not on a protection device of a No. 2 main transformer protection measurement and control screen, and checking whether the three-phase voltage indication is normal or not on a No. 2 main transformer electric energy meter of a metering screen; and checking whether the three-phase voltage value and the phase of the second section of bus are correct or not in the fault recording management system, checking whether the three-phase voltage value and the phase of the second section of bus are correct or not on the frequency-voltage emergency control device, and executing the next step if the three-phase voltage value and the phase of the second section of bus are correct or not.
Specifically, step 3 includes:
s115: closing a PT secondary voltage air switch of a 10kV II-section bus, checking whether the three-phase voltage value and the phase are correct or not on a protection device of a 2-section main transformer protection and measurement control screen, a No. 2 main transformer 10kV side electric energy meter of a metering screen, a fault recording management system of a dynamic recording device screen of an electric power system and a frequency and voltage emergency control device of a low-cycle low-voltage load shedding screen, and referring to 10-13 in detailed steps (namely steps S110 to S113);
it can be understood that the specific detection manner in step 3 is the same as that in step 2, and for the sake of brevity, the detailed description is omitted here.
Thereafter, the method of the present embodiment further includes:
and 4, step 4: respectively carrying out phase checking on PT secondary three-phase voltages of the first-section bus and the second-section bus, testing whether the phases are correct or not, and if so, executing the next step;
as shown in fig. 2, step 4 includes:
s116: the method comprises the following steps that PT secondary three-phase voltages of 10kV I and II section buses are subjected to phase checking respectively at terminal blocks of a control cabinet door of a 10kV I and II bus-coupled 1100-2 isolated handcart cabinet, and whether the phase is correct or not is tested;
illustratively, PT secondary three-phase voltages of 10kV I and II section buses can be subjected to phase checking at terminal blocks of a control cabinet door of a 10kV I and II bus coupling 1100-2 isolation handcart cabinet. For example, by a voltage test method, when the detected voltage values are: uaa ' 0V, Uab ' 104V, Uac ' 104V; uba ═ 104V, Ubb ═ 0V, Ubc ═ 104V; when Uca ' 104V, Ucb ' 104V, Ucc ' is 0V, it indicates that the voltage value is correct. When the values of the detected phase angles are: Φ aa ═ 0 °, Φ ab ═ 120 °, Φ ac ═ 120 °; Φ ba ' 120 °, Φ bb ' 0 °, Φ bc ' 120 °; if Φ ca ' ═ 120 °, Φ cb ' ═ 120 °, and Φ cc ' ═ 0 °, it indicates that the voltage phase is correct. It should be noted that the three-phase voltages Ua, Ub, and Uc are secondary three-phase voltages of a 10kV i-section bus PT, and the three-phase voltages Ua ', Ub ', and Uc ' are secondary three-phase voltages of a 10kV ii-section bus PT.
Therefore, when power is supplied by the same power supply, the voltage phase is verified on the secondary voltage side of the 10kV I and II section bus PT, and the verification is accurate.
Thereafter, the method of the present embodiment further includes:
and 5: disconnecting the secondary voltage of the II-section bus PT, testing whether the three-phase voltage indication of a voltmeter on a handcart control cabinet door of the bus tie circuit breaker is normal or not, and if so, executing the next step;
as shown in fig. 2, step 5 specifically includes:
s117: disconnecting the secondary voltage of the 10kV II-section bus PT 1082PT and switching on the bus in an idle state;
s118: rotating a PT secondary voltage parallel conversion handle on a control cabinet door of a 10kV I and II bus-coupled 1100-2 isolation handcart from a splitting position to a parallel position, and checking whether three-phase voltage indication is normal or not on a voltmeter on the control cabinet door of the 10kV I and II bus-coupled 1100 circuit breaker handcart;
for example, when the phase voltages Ua, Ub and Uc displayed on the voltmeter on the handcart control cabinet door of the 10kV I and II bus tie 1100 circuit breaker are detected to be 60V, the voltage is normal. It can be understood that the three-phase voltage on the handcart control cabinet door of the 10kV I and II bus coupler 1100 circuit breaker is the voltage of the 10kV II section bus PT 1082PT secondary voltage on the air switch load side, and when the voltage value is detected, the PT secondary voltage of the 10kV I section bus is switched to the PT secondary voltage of the 10kV II section bus in parallel, and the work is normal.
S119: testing whether a PT secondary voltage parallel switching device of a 10kV I and II section bus works normally, rotating a voltage parallel conversion handle from a parallel position to a disconnection position, and checking whether a three-phase voltage indication is zero or not on a voltmeter on a handcart control cabinet door of a 10kV I and II bus-coupled 1100 circuit breaker;
for example, after the PT secondary voltage parallel conversion handle rotates from the parallel position to the disconnection position, if the indication of three-phase voltages is detected to be zero, the PT secondary voltage disconnection operation of 10kV I and II section buses is normal.
Thereafter, the method of the present embodiment further includes:
step 6: switching on the secondary voltage of a second-section bus PT, disconnecting a bus coupler circuit breaker, switching on a circuit breaker between a No. 2 main transformer and the second-section bus, supplying power to the second-section bus, performing phase checking on the PT secondary three-phase voltages of the first-section bus and the second-section bus respectively, testing whether the phase is correct, and if so, executing the next step;
specifically, as shown in fig. 2, step 6 specifically includes:
s120: closing the PT secondary voltage of the 10kV II-section bus and opening the PT secondary voltage;
s121: disconnecting a 10kV I and II bus coupler 1100 circuit breaker;
s122: shaking a handcart of a No. 2 main transformer 10kV side 1002 circuit breaker from a test position to a working position;
s123: and closing a No. 2 main transformer 10kV side 1002 circuit breaker. Supplying power to a 10kV II-section bus;
s124: the method comprises the following steps that PT secondary three-phase voltages of 10kV I and II section buses are subjected to phase checking respectively at terminal blocks of a control cabinet door of a 10kV I and II bus-coupled 1100-2 isolated handcart cabinet, and whether the phase is correct or not is tested;
illustratively, the phase checking can be carried out on the three-phase voltages on the secondary sides of 10kV I and II section buses PT at the terminal rows of the control cabinet door of the 10kV I and II bus coupler 1100-2 isolation handcart cabinet. For example, by a voltage test method, when the detected voltage values are: uaa ' 0V, Uab ' 104V, Uac ' 104V; uba ═ 104V, Ubb ═ 0V, Ubc ═ 104V; when Uca ' 104V, Ucb ' 104V, Ucc ' is 0V, it indicates that the voltage value is correct. When the values of the detected phase angles are: Φ aa ═ 0 °, Φ ab ═ 120 °, Φ ac ═ 120 °; Φ ba ' 120 °, Φ bb ' 0 °, Φ bc ' 120 °; if Φ ca ' ═ 120 °, Φ cb ' ═ 120 °, and Φ cc ' ═ 0 °, it indicates that the voltage phase is correct. It should be noted that the three-phase voltages Ua, Ub, and Uc are secondary three-phase voltages of a 10kV i-section bus PT, and the three-phase voltages Ua ', Ub ', and Uc ' are secondary three-phase voltages of a 10kV ii-section bus PT.
Therefore, when power is supplied by different power supplies, the voltage phase is verified on the secondary voltage side of the 10kV I and II section bus PT, and the verification is accurate.
Finally, the method of the present embodiment further includes:
and 7: when the phases are checked and tested to be correct, the three-phase power supply voltage phases of the primary systems of the first-section bus and the second-section bus can be determined to be the same;
specifically, as shown in fig. 2, step 7 specifically includes:
s125: and the bus finishes power transmission, and the two power supply voltages have correct phase checking.
Therefore, in the embodiment, secondary phase checking can be carried out on the 10kV I-section bus and the 10kV II-section bus PT under the condition of the same power supply or different power supplies, and in the detection process, when the condition that the equipment is not abnormal and the detected voltage value and voltage phase are correct is detected, the condition that the voltage phases of the three-phase power supplies of the 10kV I-section bus and the 10kV II-section bus primary system are the same is shown, and the loop closing operation of the two power supplies and the two bus sections can be carried out.
Therefore, the method for the bus power transmission and the power phase checking of the transformer substation provided by the invention can be used for the power voltage phase checking of a newly-built transformer substation, and after the newly-built transformer substation is completed, the safety of the bus power transmission switching operation of the transformer substation is fully ensured by an effective power transmission and power phase checking method, the accuracy of the power voltage phase checking is ensured, and the method plays an important role in the later stable operation of the transformer substation.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The method for bus power transmission and power supply phase checking of the transformer substation is characterized by being used for a transformer substation power supply and distribution system, wherein the transformer substation power supply and distribution system comprises a first section bus and a second section bus, the first section bus is connected with a No. 1 main transformer and the first section bus PT, the second section bus is connected with a No. 2 main transformer and the second section bus PT, the first section bus and the second section bus are mutually connected through a bus coupler, and the method comprises the following steps:
step 1: setting the secondary voltage idle switch of the first section of bus PT and the second section of bus PT to be in a disconnected state, electrically connecting the first section of bus and the second section of bus through a bus coupler, closing a circuit breaker between a No. 1 main transformer and the first section of bus, supplying power to the first section of bus and the second section of bus, detecting whether the first section of bus and the second section of bus are normal, and if so, executing the next step;
step 2: closing the secondary voltage of the first-section bus PT, opening the bus in an air mode, detecting whether the three-phase voltage value and the phase of the first-section bus are correct or not, and if yes, executing the next step;
and step 3: closing the secondary voltage of the II-section bus PT, opening the bus in an air mode, detecting whether the three-phase voltage value and the phase of the II-section bus are correct or not, and if yes, executing the next step;
and 4, step 4: respectively carrying out phase checking on the PT secondary side three-phase voltages of the first-section bus and the second-section bus, testing whether the phases are correct or not, and if so, executing the next step;
and 5: disconnecting the secondary voltage of the II-section bus PT, testing whether the three-phase voltage indication of a voltmeter on a handcart control cabinet door of the bus tie circuit breaker is normal or not, and if so, executing the next step;
step 6: switching on a secondary voltage of a second-section bus PT, disconnecting a bus coupler circuit breaker, switching on a circuit breaker between a No. 2 main transformer and the second-section bus, supplying power to the second-section bus, performing phase checking on the PT secondary side three-phase voltages of the first-section bus and the second-section bus respectively, testing whether the phase is correct, and if so, executing the next step;
and 7: when the phases are checked and tested to be correct, the three-phase power supply voltage phases of the primary system of the I section of bus and the II section of bus can be determined to be the same.
2. The method for substation bus power transmission and power supply phase checking according to claim 1, further comprising, in step 1:
setting secondary voltage parallel conversion handles of the first section of bus PT and the second section of bus PT at a splitting position; respectively arranging the handcart cabinets of the first section of bus PT and the second section of bus PT at working positions; the handcart cabinet of the bus coupler is arranged at a working position.
3. The method for substation bus power transmission and power supply phase checking according to claim 2, wherein in the step 1, the method further comprises:
when supplying power to I section generating line and II sections generating lines, strike 3 times in succession to whether I section generating line and II section generating line equipment are normal is detected, if normal, then carry out next step.
4. The method for substation bus power transmission and power supply phase checking according to claim 3, wherein in the step 1, the method further comprises:
and detecting whether the three-phase voltage and the open delta voltage on the secondary voltage air-break power supply side of the I section of bus PT are normal, if so, executing the next step.
5. The method for bus power transmission and power supply phase checking of the transformer substation according to claim 1, wherein the transformer substation power supply and distribution system comprises a protection device of a protection and measurement control screen of a main transformer 1 associated with the main transformer 1 and a power meter of a metering screen, and a fault recording management system and a frequency-voltage emergency control device associated with a bus in a section i, and in the step 2, the method further comprises:
checking whether the three-phase voltage value and the phase are correct or not on a protection device of a No. 1 main transformer protection measurement and control screen, and checking whether the three-phase voltage indication is normal or not on a No. 1 main transformer electric energy meter of a metering screen; whether the three-phase voltage value and the phase of the I-section bus are correct or not is checked in the fault recording management system, whether the three-phase voltage value and the phase of the I-section bus are correct or not is checked on the frequency-voltage emergency control device, and if yes, the next step is executed.
6. The method for bus power transmission and power supply phase checking of the transformer substation according to claim 1, wherein the transformer substation power supply and distribution system comprises a protection device of a protection and measurement control screen of a No. 2 main transformer associated with the No. 2 main transformer and a power meter of a metering screen, and a fault recording management system and a frequency-voltage emergency control device associated with a section II bus, and in the step 3, the method further comprises:
checking whether the three-phase voltage value and the phase are correct or not on a protection device of a No. 2 main transformer protection measurement and control screen, and checking whether the three-phase voltage indication is normal or not on a No. 2 main transformer electric energy meter of a metering screen; and checking whether the three-phase voltage value and the phase of the second section of bus are correct or not in the fault recording management system, checking whether the three-phase voltage value and the phase of the second section of bus are correct or not on the frequency-voltage emergency control device, and executing the next step if the three-phase voltage value and the phase of the second section of bus are correct or not.
7. The method for substation bus power transmission and power supply phase checking according to claim 1, further comprising, in the step 5:
the PT secondary voltage parallel conversion handle on the control cabinet door of the bus-coupled isolation handcart is rotated to a parallel position from a splitting position, whether three-phase voltage indication is normal or not is checked on a voltmeter on the control cabinet door of the bus-coupled circuit breaker handcart, and if yes, the next step is executed.
8. The method for substation bus power transmission and power supply phase checking according to claim 7, further comprising, in the step 5:
the parallel test device for the PT secondary voltage of the first-section bus and the second-section bus works normally, the parallel voltage conversion handle is rotated to a splitting position from a parallel position, and on a voltmeter on a handcart control cabinet door of the bus tie circuit breaker, whether three-phase voltage indication is zero or not is checked.
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