CN112946513A - Phase checking method for power supply of transformer substation - Google Patents
Phase checking method for power supply of transformer substation Download PDFInfo
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- 238000009413 insulation Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
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- 238000012423 maintenance Methods 0.000 claims description 5
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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
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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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
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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Abstract
The invention discloses a phase checking method for a transformer substation power supply. The method comprises the following steps: carrying out phase test on a three-phase power supply behind a 35kV first path power supply incoming line switch cabinet; carrying out no-load power transmission on a 35kV second power circuit; carrying out phase test on two paths of three-phase power supplies in front of and behind a 35kV second path power supply incoming line switch cabinet; checking whether the phases of the second path of power supply and the first path of power supply are consistent or not according to the test result; if the phase of the second power supply is consistent with that of the first power supply, the second power supply is correct in phase checking, and power supply phase checking is completed; if the phases of the second power supply and the first power supply are not consistent, the power is cut off for the 35kV second power supply line, the wiring mode of the 35kV second power supply incoming three-phase cable is adjusted according to the test result, and the phase test is carried out again until the phases of the second power supply and the first power supply are consistent. The method can realize the rapid test of the phase and the phase sequence of the line power supply after the incoming line power supply line of the transformer substation is overhauled or the power transmission is improved, and has the advantages of simple and convenient operation, safety and reliability.
Description
Technical Field
The invention relates to the technical field of power supply of transformer substations, in particular to a phase checking method of a transformer substation power supply.
Background
In order to improve the power supply reliability of the transformer substation, the incoming line power supplies of most of the transformer substations adopt two power supply lines for power supply. When one power supply line is overhauled or has a fault, the other power supply line supplies power so as to ensure the reliable power supply of the power users. Because a fixed phase difference exists between three phases of a three-phase power supply system, when two or more than two three-phase power supplies are connected in parallel or closed in a loop mode, if the phases or phase sequences of the power supplies are different, a short-circuit accident is caused, huge current is generated, and the damage of a generator or electrical equipment is caused; and if the phase sequences are inconsistent, abnormal operation of the three-phase equipment at the user side can be caused.
Therefore, a phase verification method for a transformer substation power supply is urgently needed for solving the problems existing in the parallel operation or loop closing of the three-phase power supply of the transformer substation, so that after an incoming line power supply line of the transformer substation is overhauled or replaced, transformed and transmitted, the phase and the phase sequence of the three-phase power supply of the transformer substation are quickly tested, the safety and the correctness of the parallel operation or loop closing of two paths of power supplies are ensured, the occurrence of short-circuit accidents is avoided, and the phase sequence of a power supply and distribution line can be consistent with the phase sequence required by a three-.
Disclosure of Invention
In order to solve part or all of technical problems in the prior art, the invention provides a phase checking method for a substation power supply.
The invention discloses the following technical scheme:
the invention discloses a phase checking method for a transformer substation power supply. The phase checking method of the transformer substation power supply comprises the following steps:
carrying out phase test on a three-phase power supply behind a 35kV first path power supply incoming line switch cabinet;
carrying out no-load power transmission on a 35kV second power circuit;
carrying out phase test on two paths of three-phase power supplies in front of and behind a 35kV second path power supply incoming line switch cabinet;
checking whether the phases of the second path of power supply and the first path of power supply are consistent or not according to the test result;
if the phase of the second power supply is consistent with that of the first power supply, the second power supply is correct in phase checking, and power supply phase checking is completed; if the phases of the second power supply and the first power supply are not consistent, the power is cut off for the 35kV second power supply line, the wiring mode of the 35kV second power supply incoming three-phase cable is adjusted according to the test result, and the phase test is carried out again until the phases of the second power supply and the first power supply are consistent.
Further, in the phase checking method for the transformer substation power supply, a phase checking instrument is adopted to perform phase testing on a three-phase power supply behind a 35kV first path power supply incoming line switch cabinet.
Further, in the substation power supply phase checking method, the phase testing of the three-phase power supply after the 35kV first path power supply incoming line switch cabinet by using the phase checking instrument further includes:
opening a back door of a 35kV first path power supply incoming line switch cabinet, contacting an insulating rod connected with a first transmitter of a nuclear phase instrument with an incoming line cable terminal connector connected with a fixed contact of an isolating switch of the 35kV first path power supply incoming line switch cabinet A, contacting an insulating rod connected with a second transmitter of the nuclear phase instrument with an incoming line cable terminal connector connected with a fixed contact of an isolating switch of the 35kV first path power supply incoming line switch cabinet B, and reading and recording a phase angle value on a receiver of the nuclear phase instrument;
keeping an insulating rod connected with a first transmitter of the nuclear phase instrument still at an original contact position, contacting the insulating rod connected with a second transmitter of the nuclear phase instrument with an incoming cable terminal connector connected with a static contact of a 35kV first path power incoming switch cabinet C isolating switch, and reading and recording a phase angle value on a receiver of the nuclear phase instrument.
Further, in the substation power supply phase checking method, the 35kV second power line no-load power transmission further includes:
and switching the maintenance state of the 35kV second power line route to a cold standby state, and carrying out no-load power transmission on the 35kV second power line.
Further, in the phase checking method for the transformer substation power supply, a phase checking instrument is adopted to perform phase testing on two paths of three-phase power supplies in front of and behind a 35kV second path power supply incoming line switch cabinet.
Further, in the phase verification method for the transformer substation power supply, the phase testing of the two three-phase power supplies before and after the 35kV second power supply incoming line switch cabinet by using the phase verification instrument further includes:
opening a rear door of a 35kV second power incoming line switch cabinet, contacting an insulating rod connected with a first transmitter of a nuclear phase instrument with an A-phase 35kV II-section bus bar connected with a moving contact of an isolating switch of the 35kV second power incoming line switch cabinet in front of the 35kV second power incoming line switch cabinet, sequentially contacting the insulating rod connected with a second transmitter of the nuclear phase instrument with incoming line cable terminal connectors connected with fixed contacts of A-phase, B-phase and C-phase isolating switches of the 35kV second power incoming line switch cabinet after the 35kV second power incoming line switch cabinet, and sequentially reading and recording phase angle values on a receiver of the nuclear phase instrument;
before a 35kV second power incoming line switch cabinet, an insulating rod connected with a first transmitter of a nuclear phase instrument is contacted with a B-phase 35kV II-section busbar connected with a moving contact of an isolating switch of the 35kV second power incoming line switch cabinet, after the 35kV second power incoming line switch cabinet, the insulating rod connected with a second transmitter of the nuclear phase instrument is sequentially contacted with incoming line cable terminal connectors connected with static contacts of A-phase, B-phase and C-phase isolating switches of the 35kV second power incoming line switch cabinet, and phase angle values on a receiver of the nuclear phase instrument are sequentially read and recorded;
before a 35kV second power supply incoming line switch cabinet, an insulating rod connected with a first transmitter of a nuclear phase instrument is contacted with a C-phase 35kV II-section busbar connected with a moving contact of an isolating switch of the 35kV second power supply incoming line switch cabinet, after the 35kV second power supply incoming line switch cabinet, the insulating rod connected with a second transmitter of the nuclear phase instrument is sequentially contacted with incoming line cable terminal connectors connected with static contacts of A-phase, B-phase and C-phase isolating switches of the 35kV second power supply incoming line switch cabinet, and phase angle values on a receiver of the nuclear phase instrument are sequentially read and recorded.
Further, in the substation power supply phase checking method, the checking whether the phases of the second power supply and the first power supply are consistent according to the test result further includes:
and selecting one phase of the three phases of the first path of power supply as a reference phase, making a three-phase power supply phase angle relation diagram and a three-phase power supply phasor coordinate relation diagram based on the reference phase and a test result, and checking and confirming whether the phases of the second path of power supply and the first path of power supply are consistent or not according to the three-phase power supply phase angle relation diagram and the three-phase power supply phasor coordinate relation diagram.
Further, in the above-mentioned substation power supply nuclear phase method, still include: before phase testing is carried out on a three-phase power supply behind a 35kV first path power supply incoming line switch cabinet, preparation before a nuclear phase is carried out.
Further, in the above-mentioned substation power supply nuclear phase method, still include: and after the preparation work before the nuclear phase is finished, handling a power supply nuclear phase overhaul work ticket.
Further, in the above-mentioned substation power supply nuclear phase method, still include: after the overhaul operation of the 35kV second power supply circuit is completed, the 35kV second power supply circuit is changed into a cold standby state, insulation resistance testing is carried out on A, B, C three phases of the 35kV second power supply circuit, and confirmation tests are carried out on A, B, C three-phase phases on two sides of the 35kV second power supply circuit.
The technical scheme of the invention has the following main advantages:
the phase checking method of the transformer substation power supply can realize the rapid test of the phase and the phase sequence of the three-phase power supply of the line after the incoming line power supply line of the transformer substation is overhauled or updated, transformed and transmitted, ensure the safety and the correctness of the parallel operation or loop closing of two paths of power supplies, avoid the occurrence of short-circuit accidents, ensure that the phase sequence of the power supply and distribution line is consistent with the phase sequence required by a three-phase load of a user, and has the advantages of simple and convenient operation, safety and reliability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention by way of example only and are not to be construed as limiting the embodiments of the invention in any way. In the drawings:
fig. 1 is a schematic diagram of a power supply system of a typical 35kV substation and its superior grid in the prior art;
fig. 2 is a flowchart of a phase checking method for a substation power supply according to an embodiment of the present invention;
fig. 3 is a schematic diagram of phase angle relationship of three-phase power sources of a 35kV first-path power incoming line switch cabinet according to an example of the embodiment of the present invention;
fig. 4 is a schematic diagram of phasor coordinates of a three-phase power supply of a 35kV first-path power supply incoming line switch cabinet according to an example of the embodiment of the present invention;
fig. 5 is a schematic diagram of a three-phase power phase angle relationship of two power incoming lines tested in a 35kV second power incoming line switchgear according to an example of the embodiment of the present invention;
fig. 6 is a schematic diagram of phasor coordinates of a three-phase power supply of a second power incoming line tested in a 35kV second power incoming line switch cabinet according to an example of the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms first, second and the like in the description and in the claims, and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be practiced otherwise than as specifically illustrated.
Fig. 1 is a schematic diagram of a power supply system of a typical 35kV substation and its upper-level power grid in the prior art. In order to more clearly illustrate the technical scheme of the invention, firstly, the principle and the working process of the power supply system of the 35kV substation and the superior power grid thereof are explained.
As shown in fig. 1, the 35kV substation is powered by two power lines, which are respectively powered by the 35kV i and ii buses of the upper 110kV substation, and are powered to a 35kV first power incoming line switch cabinet 3501 and a 35kV second power incoming line switch cabinet 3502 of the 35kV substation through an overhead line and a cable line. The 35kV first power supply incoming line switch cabinet 3501 supplies power for a 35kV I section bus, and the 35kV second power supply incoming line switch cabinet 3502 supplies power for a 35kV II section bus.
The switch cabinet of 35kV transformer substation is fixed switch cabinet, the current power supply operation mode is that the first way power supply inlet wire switch cabinet 3501 of 35kV transformer substation supplies power for the I section generating line of 35kV transformer substation, the second way power supply circuit of 35kV (comprising overhead line and cable run) implements the renewal transformation, cleans and overhauls the II section generating line of 35kV and the circuit that presents out synchronously, the female gang switch cabinet 3500 circuit breaker of 35kV I, II and isolator 3500-2 are in the state of overhaul.
And (5) finishing the maintenance work, and removing safety measures. Closing 35kV I, II bus-coupled 3500-1 and-2 isolation disconnecting switches, closing 35kV I, II bus-coupled 3500 circuit breakers, supplying power to 35kV II section buses through the bus-coupled circuit breakers, enabling a 35kV second power circuit and a power incoming line switch cabinet thereof to be in a cold standby state, and enabling output line cabinets and other equipment of a 35kV II section bus system to be in a cold standby state.
Fig. 2 is a flowchart of a phase checking method for a substation power supply according to an embodiment of the present invention. Taking the power supply system of the 35kV substation and the upper-level grid thereof shown in fig. 1 as an example, as shown in fig. 2, the substation power supply phase checking method provided by an embodiment of the present invention includes the following steps S1-S5:
s1, carrying out phase test on the three-phase power supply after the 35kV first path power supply incoming line switch cabinet;
s2, carrying out no-load power transmission on a 35kV second power circuit;
s3, carrying out phase test on two paths of three-phase power supplies in front of and behind a 35kV second path of power supply incoming line switch cabinet;
s4, checking whether the phases of the second path of power supply and the first path of power supply are consistent or not according to the test result;
s5, if the phase of the second path of power supply is consistent with that of the first path of power supply, the second path of power supply is correct in phase, and power supply phase checking is completed; if the phases of the second power supply and the first power supply are not consistent, the power is cut off for the 35kV second power supply line, the wiring mode of the 35kV second power supply incoming three-phase cable is adjusted according to the test result, and the phase test is carried out again until the phases of the second power supply and the first power supply are consistent.
The principle and process of the substation power supply phase checking method provided by an embodiment of the invention are specifically described below.
And S1, carrying out phase test on the three-phase power supply behind the 35kV first-path power supply incoming line switch cabinet.
Specifically, in order to facilitate phase testing and improve accuracy and safety of the phase testing, a phase tester is adopted to perform phase testing on a three-phase power supply behind a 35kV first power supply incoming line switch cabinet.
The phase test of the three-phase power supply after the 35kV first path power supply incoming line switch cabinet by adopting the nuclear phase instrument specifically comprises the following steps:
s11, opening a back door of a 35kV first power incoming line switch cabinet 3501, contacting an insulating rod connected to a first transmitter of a nuclear phase instrument with an incoming cable terminal connector connected to a fixed contact of an isolation switch 3501-1 of an isolation switch 3501A of the 35kV first power incoming line switch cabinet 3501, contacting an insulating rod connected to a second transmitter of the nuclear phase instrument with an incoming cable terminal connector connected to a fixed contact of an isolation switch 3501-1 of a 35kV first power incoming line switch cabinet 3501B, and reading and recording a phase angle value on a receiver of the nuclear phase instrument;
and S12, keeping an insulating rod connected with a first transmitter of the nuclear phase instrument still at an original contact position, contacting the insulating rod connected with a second transmitter of the nuclear phase instrument with an incoming cable terminal connector connected with a fixed contact of an isolation switch 3501-1 of a 35kV first power incoming switch cabinet 3501C, and reading and recording a phase angle value on a receiver of the nuclear phase instrument.
If the phase test result of the first power supply is that the phase A leads the phase B by 120 degrees and the phase A leads the phase C by 240 degrees, the first power supply is in positive phase sequence.
The phase checking instrument can adopt an YHX-3000 type satellite time service remote wireless phase checking instrument, for example, the phase checking instrument comprises two transmitters No.1 and No.2, a receiver and a telescopic insulating rod connected on the two transmitters, can remotely check phases without being limited by terrain, has a GSM short message communication function, can mutually send test data to an opposite party, can automatically finish phase checking, and displays a phase difference and a phase checking result, has a phase checking result voice broadcasting function, and can realize frequency, phase and phase sequence tests and phase diagram display.
And S2, carrying out no-load power transmission on the 35kV second power supply line.
The 35kV second power circuit no-load power transmission specifically comprises:
and after the 35kV second power line maintenance operation is completed, converting the route maintenance state of the 35kV second power line into a cold standby state, and carrying out no-load power transmission on the 35kV second power line.
And S3, carrying out phase test on two paths of three-phase power supplies in front of and behind the 35kV second path power supply incoming line switch cabinet.
Specifically, in order to facilitate phase testing and improve accuracy and safety of the phase testing, a nuclear phase instrument is adopted to perform phase testing on two paths of three-phase power supplies in front of and behind a 35kV second path power supply incoming line switch cabinet.
The phase testing of the two paths of three-phase power supplies in front of and behind the 35kV second path power supply incoming line switch cabinet by adopting the nuclear phase instrument specifically comprises the following steps:
s31, opening a rear door of a 35kV second power supply incoming line switch cabinet 3502, contacting an insulating rod connected with a first transmitter of a nuclear phase instrument with an A-phase 35kV II-section bus bar connected with a moving contact of a 35kV second power supply incoming line switch cabinet 3502 isolating switch 3502-2 in front of the 35kV second power supply incoming line switch cabinet, sequentially contacting an insulating rod connected with a second transmitter of the nuclear phase instrument with an incoming cable terminal connector connected with a fixed contact of 35kV second power supply incoming line switch cabinet 3502A-phase, B-phase and C-phase isolating switches 3502-1 after the 35kV second power supply incoming line switch cabinet, and sequentially reading and recording a phase angle value on a receiver of the nuclear phase instrument;
s32, before a 35kV second-path power supply incoming line switch cabinet, contacting an insulating rod connected with a first transmitter of a nuclear phase instrument with a B-phase 35kV II-section bus bar connected with a moving contact of a 35kV second-path power supply incoming line switch cabinet 3502-2 isolation switch, and after the 35kV second-path power supply incoming line switch cabinet, sequentially contacting the insulating rod connected with the second transmitter of the nuclear phase instrument with an incoming line cable terminal connector connected with a static contact of a 35kV second-path power supply incoming line switch cabinet 3502A-phase, B-phase and C-phase isolation switch 3502-1, and sequentially reading and recording a phase angle value on a receiver of the nuclear phase instrument;
and S33, before the 35kV second power supply incoming line switch cabinet, contacting an insulating rod connected with a first transmitter of the nuclear phase instrument with a C-phase 35kV II-section busbar connected with a moving contact of a 35kV second power supply incoming line switch cabinet 3502-2 isolating switch 3502-2, and after the 35kV second power supply incoming line switch cabinet, sequentially contacting the insulating rod connected with the second transmitter of the nuclear phase instrument with an incoming cable terminal connector connected with a static contact of a 35kV second power supply incoming line switch cabinet 3502A-phase, B-phase and C-phase isolating switch 3502-1, and sequentially reading and recording a phase angle value on a receiver of the nuclear phase instrument.
S4, checking whether the phases of the second path of power supply and the first path of power supply are consistent or not according to the test result;
the phase of the second power supply is consistent with that of the first power supply, so that the checking efficiency and accuracy are improved; and checking whether the phases of the second path of power supply and the first path of power supply are consistent according to the test result, which specifically comprises the following steps:
and selecting one phase of the three phases of the first path of power supply as a reference phase, making a three-phase power supply phase angle relation diagram and a three-phase power supply phasor coordinate relation diagram based on the reference phase and a test result, and checking and confirming whether the phases of the second path of power supply and the first path of power supply are consistent or not according to the three-phase power supply phase angle relation diagram and the three-phase power supply phasor coordinate relation diagram.
Fig. 3 is a schematic diagram of phase angle relationship between three phases of a 35kV first power incoming line switchgear provided by an example of the present invention, and fig. 4 is a schematic diagram of phasor coordinates of three phases of a 35kV first power incoming line switchgear provided by an example of the present invention; as shown in fig. 3 and 4, in this example, phase a of the insulation bar contact of the first emitter connection of the nuclear phase instrument is selected as the reference phase, and according to the test results, the 35kV first incoming line power supply is in positive phase sequence.
Fig. 5 is a schematic diagram of phase angle relationship between three phases of power sources of two power incoming lines tested in a 35kV second power incoming line switch cabinet according to an example of the present invention, and fig. 6 is a schematic diagram of phasor coordinates of three phases of power sources of a second power incoming line tested in a 35kV second power incoming line switch cabinet according to an example of the present invention; as shown in fig. 5 and 6, in this example, the phase in contact with the insulation rod connected to the first emitter of the nuclear phase instrument is selected as the reference phase, and if the phase of the voltage a phase of the 35kV first power source tested before the 35kV second power source incoming switch cabinet 3502 cabinet is assumed to be 0 ° and can be considered to be coincident with the X-axis of the coordinate axis, the phases (240 ° and 120 ° respectively) of the B, C two phases of the voltage of the 35kV second power source tested after the 35kV second power source incoming switch cabinet 3502 cabinet fall in the third quadrant and the second quadrant of the coordinate axis respectively, and the phase of the voltage a phase leads the phase of the voltage B phase by 120 ° and the phase of the voltage a phase leads the phase of the voltage C phase by 240 °. According to the test results of all three-phase power supplies with two power supply incoming lines shown in fig. 5, the voltages of the two power supplies tested at the front side and the rear side of the 35kV second power supply incoming line switch cabinet 3502 are in the same phase, that is, the 35kV second incoming line power supply and the 35kV first incoming line power supply are in the same phase and are in positive phase sequence.
The receiver phase angle of the nuclear phase instrument indicates "in phase" when it shows "0" or "360", and indicates "out of phase" when it shows "120" or "240".
S5, if the phase of the second path of power supply is consistent with that of the first path of power supply, the second path of power supply is correct in phase, and power supply phase checking is completed; if the phases of the second power supply and the first power supply are not consistent, the power is cut off for the 35kV second power supply line, the wiring mode of the 35kV second power supply incoming three-phase cable is adjusted according to the test result, and the phase test is carried out again until the phases of the second power supply and the first power supply are consistent.
Specifically, if the phase of the second power supply is consistent with that of the first power supply, the phase of the second power supply is correct, and the power supply phase checking is completed; if the phases of the second power supply and the first power supply are not consistent, the power is cut off for the 35kV second power supply line, the wiring mode of the 35kV second power supply incoming three-phase cable is adjusted according to a specific test result, the phase test is carried out again according to the steps S1-S4 until the phases of the second power supply and the first power supply are consistent, and the power supply phase checking is completed.
Further, after the power supply phase checking is completed, the rear door of the 35kV first power supply incoming line switch cabinet 3501 and the rear door of the 35kV second power supply incoming line switch cabinet 3502 need to be closed in time to ensure safe use of the transformer substation.
Further, in order to ensure the safety and accuracy of the power supply phase checking and facilitate the subsequent specific operation of the power supply phase checking, the transformer substation power supply phase checking method further comprises the following steps:
before phase testing is carried out on a three-phase power supply behind a 35kV first path power supply incoming line switch cabinet, preparation before a nuclear phase is carried out.
Specifically, the pre-nuclear phase preparation work includes: confirming the position of a phase checking point, preparing to check a phase checking instrument, configuring and dividing workers, and preparing to check a safety insulation protection product.
The confirming of the nuclear phase position specifically comprises: before the nuclear phase, the operation mode of a power supply device and a power supply system of a transformer substation is known in field investigation, the type of a high-voltage switch cabinet of the transformer substation is known, and the nuclear phase position is determined to be selected at a bus connection cabinet of two sections of buses or at an incoming line switch cabinet of a power line to be transmitted, and the specific nuclear phase point is at which two positions in the switch cabinet.
In order to ensure the safety and accuracy of the nuclear phase, the nuclear phase point is located in the same switch cabinet.
The preparation examination phase checking instrument specifically comprises the following steps: selecting a proper phase checking instrument, checking whether all parts of the phase checking instrument are intact, whether the battery power is enough, and whether the page display is clear and normal; if the nuclear phase instrument has defects, the nuclear phase instrument is replaced in time.
The personnel configuration and division specifically comprises the following steps: and carrying out personnel configuration and personnel division according to specific nuclear phase working contents so as to ensure that the power supply nuclear phase is successfully completed.
Specifically, aiming at the mode of carrying out phase test on a three-phase power supply by using a phase tester, four operators can be distributed to carry out phase test work, one operator holds an insulating rod connected with a first transmitter and carries out corresponding operation in the phase test process of the power supply, one operator holds an insulating rod connected with a second transmitter and carries out corresponding operation in the phase test process of the power supply, one operator holds a receiver and carries out data reading in the phase test process of the power supply, and one operator is responsible for safety supervision, password sending, command coordination and phase test data recording.
The preparation of the safety insulation protective product comprises the following steps: the safety insulation products such as insulation boots, insulation gloves and the like are equipped and checked.
Further, in order to ensure safe implementation and smooth completion of the substation power supply phase checking, the substation power supply phase checking method further comprises the following steps: and after the preparation work before the nuclear phase is finished, handling a power supply nuclear phase overhaul work ticket.
Further, in order to ensure the safety and accuracy of the power supply phase checking, the substation power supply phase checking method further comprises the following steps: after the overhaul operation of the 35kV second power supply circuit is completed, the overhaul state of the 35kV second power supply circuit is changed into a cold standby state, insulation resistance testing is carried out on A, B, C three phases of the 35kV second power supply circuit, and confirmation tests are carried out on A, B, C three-phase phases on two sides of the 35kV second power supply circuit.
The phase checking method for the transformer substation power supply can realize the rapid test of the phase and the phase sequence of the three-phase power supply after the transformation or the overhaul and the power transmission of the incoming line power supply line of the transformer substation, ensure that two power supplies are closed or are parallel safely and correctly, ensure that the phase sequence of the power supply and distribution line is consistent with the phase sequence required by a three-phase load of a user, and has the advantages of simple and convenient operation, safety and reliability.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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 (10)
1. A phase checking method for a power supply of a transformer substation is characterized by comprising the following steps:
carrying out phase test on a three-phase power supply behind a 35kV first path power supply incoming line switch cabinet;
carrying out no-load power transmission on a 35kV second power circuit;
carrying out phase test on two paths of three-phase power supplies in front of and behind a 35kV second path power supply incoming line switch cabinet;
checking whether the phases of the second path of power supply and the first path of power supply are consistent or not according to the test result;
if the phase of the second power supply is consistent with that of the first power supply, the second power supply is correct in phase checking, and power supply phase checking is completed; if the phases of the second power supply and the first power supply are not consistent, the power is cut off for the 35kV second power supply line, the wiring mode of the 35kV second power supply incoming three-phase cable is adjusted according to the test result, and the phase test is carried out again until the phases of the second power supply and the first power supply are consistent.
2. The substation power supply phase checking method according to claim 1, wherein a phase checking instrument is adopted to perform phase testing on a three-phase power supply behind a 35kV first path power supply incoming line switch cabinet.
3. The substation power supply phase checking method according to claim 2, wherein the phase testing of the three-phase power supply after the 35kV first path power supply incoming line switch cabinet by using the phase checking instrument further comprises:
opening a back door of a 35kV first path power supply incoming line switch cabinet, contacting an insulating rod connected with a first transmitter of a nuclear phase instrument with an incoming line cable terminal connector connected with a fixed contact of an isolating switch of the 35kV first path power supply incoming line switch cabinet A, contacting an insulating rod connected with a second transmitter of the nuclear phase instrument with an incoming line cable terminal connector connected with a fixed contact of an isolating switch of the 35kV first path power supply incoming line switch cabinet B, and reading and recording a phase angle value on a receiver of the nuclear phase instrument;
keeping an insulating rod connected with a first transmitter of the nuclear phase instrument still at an original contact position, contacting the insulating rod connected with a second transmitter of the nuclear phase instrument with an incoming cable terminal connector connected with a static contact of a 35kV first path power incoming switch cabinet C isolating switch, and reading and recording a phase angle value on a receiver of the nuclear phase instrument.
4. The substation power supply nuclear phase method according to claim 1, wherein the 35kV second power line is no-load power-fed and further comprises:
and switching the maintenance state of the 35kV second power line route to a cold standby state, and carrying out no-load power transmission on the 35kV second power line.
5. The substation power supply phase checking method according to claim 1, wherein a phase checking instrument is adopted to perform phase testing on two paths of three-phase power supplies in front of and behind a 35kV second path power supply incoming line switch cabinet.
6. The substation power supply phase checking method according to claim 5, wherein the phase testing of the two three-phase power supplies in front of and behind the 35kV second power supply incoming line switch cabinet by using the phase checking instrument further comprises:
opening a rear door of a 35kV second power incoming line switch cabinet, contacting an insulating rod connected with a first transmitter of a nuclear phase instrument with an A-phase 35kV II-section bus bar connected with a moving contact of an isolating switch of the 35kV second power incoming line switch cabinet in front of the 35kV second power incoming line switch cabinet, sequentially contacting the insulating rod connected with a second transmitter of the nuclear phase instrument with incoming line cable terminal connectors connected with fixed contacts of A-phase, B-phase and C-phase isolating switches of the 35kV second power incoming line switch cabinet after the 35kV second power incoming line switch cabinet, and sequentially reading and recording phase angle values on a receiver of the nuclear phase instrument;
before a 35kV second power incoming line switch cabinet, an insulating rod connected with a first transmitter of a nuclear phase instrument is contacted with a B-phase 35kV II-section busbar connected with a moving contact of an isolating switch of the 35kV second power incoming line switch cabinet, after the 35kV second power incoming line switch cabinet, the insulating rod connected with a second transmitter of the nuclear phase instrument is sequentially contacted with incoming line cable terminal connectors connected with static contacts of A-phase, B-phase and C-phase isolating switches of the 35kV second power incoming line switch cabinet, and phase angle values on a receiver of the nuclear phase instrument are sequentially read and recorded;
before a 35kV second power supply incoming line switch cabinet, an insulating rod connected with a first transmitter of a nuclear phase instrument is contacted with a C-phase 35kV II-section busbar connected with a moving contact of an isolating switch of the 35kV second power supply incoming line switch cabinet, after the 35kV second power supply incoming line switch cabinet, the insulating rod connected with a second transmitter of the nuclear phase instrument is sequentially contacted with incoming line cable terminal connectors connected with static contacts of A-phase, B-phase and C-phase isolating switches of the 35kV second power supply incoming line switch cabinet, and phase angle values on a receiver of the nuclear phase instrument are sequentially read and recorded.
7. The substation power supply phase checking method according to claim 1, wherein the checking whether the phases of the second power supply and the first power supply are consistent according to the test result further comprises:
and selecting one phase of the three phases of the first path of power supply as a reference phase, making a three-phase power supply phase angle relation diagram and a three-phase power supply phasor coordinate relation diagram based on the reference phase and a test result, and checking and confirming whether the phases of the second path of power supply and the first path of power supply are consistent or not according to the three-phase power supply phase angle relation diagram and the three-phase power supply phasor coordinate relation diagram.
8. The substation power supply nuclear phase method according to claim 1, further comprising: before phase testing is carried out on a three-phase power supply behind a 35kV first path power supply incoming line switch cabinet, preparation before a nuclear phase is carried out.
9. The substation power supply nuclear phase method according to claim 8, further comprising: and after the preparation work before the nuclear phase is finished, handling a power supply nuclear phase overhaul work ticket.
10. The substation power supply nuclear phase method according to claim 1, further comprising: after the overhaul operation of the 35kV second power supply circuit is completed, the overhaul state of the 35kV second power supply circuit is changed into a cold standby state, insulation resistance testing is carried out on A, B, C three phases of the 35kV second power supply circuit, and confirmation tests are carried out on A, B, C three-phase phases on two sides of the 35kV second power supply circuit.
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| CN202110147876.9A CN112946513A (en) | 2021-02-03 | 2021-02-03 | Phase checking method for power supply of transformer substation |
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| CN202110147876.9A CN112946513A (en) | 2021-02-03 | 2021-02-03 | Phase checking method for power supply of transformer substation |
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Cited By (1)
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Application publication date: 20210611 |