Closed busbar phase checking and phase mismatch blocking parallel system in substation and phase checking method thereof

Abstract

The present application relates to the field of power system phase-checking technology, and in particular to a closed bus phase-checking and phase-mismatching locking parallel system in a substation and a phase-checking method thereof, the system comprising a substation and a phase-checking locking parallel module, the substation comprising a plurality of bus sections, two adjacent bus sections being connected by a bus tie circuit breaker, a plurality of insulators being arranged on each bus section, the insulators of each phase close to both sides of the bus tie circuit breaker being arranged as capacitor voltage-dividing insulators, the capacitor voltage-dividing insulators being arranged with a central connection point; the phase-checking locking parallel module is respectively connected to the central connection point of each phase in the two bus sections to be phase-checked. The system is connected to the phase-checking locking parallel module at the capacitor voltage-dividing insulators close to both sides of the bus tie circuit breaker and at the central connection point of the capacitor voltage-dividing insulator, so that the phase-checking locking parallel module can drive the voltage relay to operate when the phase of the phase check is wrong during the phase-checking process, and can also access the two adjacent bus sections through the contacts of the contactor, so as to ensure the safety and reliability of the phase check.

Description

Technical Field

[0001] The present application relates to the technical field of power system phase checking, and in particular to a closed busbar phase checking and staggered phase locking parallel system in a substation and a phase checking method thereof. Background Art

[0002] The substations of the current power system are composed of two or more main transformers. The 10kV voltage level of each main transformer is connected to the lower break of the 10kV busbar 501 / 502 circuit breaker through the high-voltage cable or busbar tube at the lower lead-out bushing of the main transformer (taking the substation composed of two main transformers as an example, each transformer is equivalent to a power supply), and the upper break of the circuit breaker is connected to the upper and lower breaks of the busbar breaker 500 respectively through the busbar, such as Fig.11 As shown, the busbar section I is between the upper break of the circuit breaker 501 and the upper break of the bus tie circuit breaker 500, and the busbar section II is between the upper break of the circuit breaker 502 and the lower break of the bus tie circuit breaker 500. There are several outgoing line intervals and PT intervals between the busbars of each circuit breaker and the bus tie circuit breaker. During operation, in order to improve the power supply reliability and prevent the power outage of some power-consuming equipment due to the failure of one power supply, the bus tie circuit breaker 500 needs to be closed so that the two busbars can run in parallel and the power-consuming equipment can be supplied by the two power supplies at the same time.

[0003] exist Fig.12 In the switch cabinet, each section of the 10kV bus contains a transformer 501 / 502 circuit breaker cabinet, a bus tie circuit breaker 500 cabinet, an outgoing line circuit breaker cabinet, and a PT interval cabinet. After the equipment is installed, the back cover of the switch cabinet is fixed with screws. When the switch cabinet is energized, if the back cover is opened, the human body will not be at a safe distance from the live parts, causing the risk of electric shock. Therefore, it is not allowed to open the back cover of the switch cabinet after it is energized. During operation, the trolley switch is moved through the trolley switch room in front of the switch cabinet to make it contact and isolate from the busbar and line. For safety reasons, insulating baffles are set at the contact points between the upper and lower breaks of the trolley switch and the busbar and line. When the trolley switch is moved to the maintenance position, the insulating baffle of the switch automatically falls down to cover the live parts to prevent the human body from touching the live parts during operation or maintenance. When the trolley switch is moved to the operating position, the insulating baffle automatically rises through the interlocking mechanism to make the upper and lower contacts of the trolley contact with the busbar and line, preparing for the closing of the trolley switch. Fig.12 In the dotted part, except for the door of the trolley switch room in the middle front of the switch cabinet, which is used for switch operation and maintenance and can be opened and closed by a handle, the rest of the parts are strictly prohibited from being opened after being energized, that is, the busbar is closed during operation.

[0004] Now assume that the #2 main transformer and cable are under repair, and the #1 main transformer is operating normally. When the #2 main transformer and cable are restored to power after the repair, close the 502 circuit breaker to energize the lower break of the #2 main transformer to the bus tie circuit breaker 500. Before closing the bus tie circuit breaker 500, it is necessary to perform a phase test between a, b, c and a', b', c' of the upper and lower breaks of the bus tie circuit breaker 500 to ensure that after 500 is closed, there may be phase sequence (phase) inconsistency due to installation wiring errors, causing short circuit accidents. Since the busbar is closed during operation, there are two existing methods for phase test:

[0005] One method is to use a high-voltage phase detector to perform a phase test at the low-voltage lead-out bushings of the #1 and #2 main transformers. However, even if the phase test is passed here and the three-phase phases are verified to be correct, it cannot guarantee the correctness of the wiring in the process of connecting the cables and busbars to the 500-bar break, because the cables and busbars are sealed and cannot be distinguished intuitively.

[0006] Another method is to move the 500 switch to the maintenance position. At this time, the insulating baffle will automatically fall down. By manually pushing open the insulating baffle, the live part of the contact between the busbar and the 500 break is exposed, and a high-voltage nuclear phase instrument is used to perform nuclear phase tests at a, b, c and a', b', c'. However, this test method requires multiple people to operate. When the insulating baffle is manually pushed open, the human body can easily touch the live part, and the space is relatively narrow. The metal contacts in the nuclear phase rod can also easily cause a relative short circuit.

[0007] The above phase checking operation requires multiple people to wear insulating gloves and insulating boots to use high-voltage phase checking sticks to contact high-voltage equipment on both sides of the circuit breaker and observe the microammeter pointer. It also requires moving the high-voltage phase checking stick position 9 times to complete, which has low work efficiency and certain safety risks. Phase checking in power systems is a regular task. Due to the limitations of the conditions at the locations where phase checking is required, the use of high-voltage phase checking instruments is dangerous and unreliable. Summary of the invention

[0008] The present application provides a closed busbar phase checking and phase-staggered locking parallel system and phase checking method in a substation, which is used to solve the technical problem that the existing power system uses a high-voltage phase checking instrument to check the phase, and this method has great operating risks and is unreliable.

[0009] In order to achieve the above objectives, this application provides the following technical solutions:

[0010] On the one hand, a locking parallel system for closed busbar core phase and staggered phase in a substation is provided, comprising:

[0011] A substation, wherein the substation comprises a plurality of busbar sections, two adjacent busbar sections are connected by a busbar tie breaker, a plurality of insulators for fixing are arranged on each busbar section, and the insulators of each phase close to both sides of the busbar tie breaker are arranged as capacitor voltage-dividing insulators, and the capacitor voltage-dividing insulators are provided with an external central connection point;

[0012] A phase-locking parallel module is used to perform phase detection on the connection phases of two adjacent busbar sections. The phase-locking parallel module is respectively connected to the central connection point of each phase in the two busbar sections to be checked. The phase-locking parallel module includes a contactor, three voltage relays connected to the contactor, and a first intermediate relay and a second intermediate relay connected to the three voltage relays. The three moving contacts of the contactor are respectively connected to the central connection point of the three phases in a section of the busbar to be checked. The coils of the three voltage relays are respectively connected to the central connection point of the three phases in another section of the busbar to be checked. The first end of the second moving contact of the first intermediate relay is connected to the closing circuit of the bus tie breaker, the second end of the second moving contact of the first intermediate relay is connected to the closing coil of the bus tie breaker, and the static contact of the second intermediate relay is connected in series with the static contact of the first intermediate relay and then connected in parallel with the second moving contact of the first intermediate relay.

[0013] Preferably, the capacitive voltage-dividing insulator comprises a main capacitor and a voltage-dividing capacitor connected in series, and a node where the main capacitor and the voltage-dividing capacitor are connected serves as a central connection point.

[0014] Preferably, the core phase locking parallel module includes a starter module, a connection node, a core phase correct indication element, a core phase error indication element and a power supply, the first end of the coil of the contactor is connected to the connection node, the connection node is connected to the positive pole of the power supply through the starter module, and the second end of the coil in the contactor is connected to the negative pole of the power supply; the static contacts of the three voltage relays are connected in series in sequence and connected between the connection node and the coil of the first intermediate relay; the moving contacts of the three voltage relays are connected in parallel and connected between the connection node and the coil of the second intermediate relay; the first moving contact of the first intermediate relay is connected in series with the core phase correct indication element and connected between the connection node and the negative pole of the power supply, and the first moving contact of the second intermediate relay is connected in series with the core phase error indication element and connected between the connection node and the negative pole of the power supply.

[0015] Preferably, the correct phase verification indication element and the incorrect phase verification indication element are both indicator signs, display screens or light-emitting elements.

[0016] Preferably, the starter module includes a normally open button and a manual switch, the normally open button and the manual switch are connected in series and are respectively connected to the positive electrode of the power supply and the connection node, and both ends of the manual switch are connected in parallel with the fourth moving contact of the contactor.

[0017] Preferably, the nuclear phase locking parallel module includes a nuclear phase working indication element, one end of which is respectively connected to the normally open button and the manual switch, and the other end of which is connected to the negative pole of the power supply.

[0018] On the other hand, a phase checking method for a closed busbar phase checking and phase-staggered interlocking parallel system in a substation is provided, which is applied to the closed busbar phase checking and phase-staggered interlocking parallel system in the substation as described above, and is characterized in that the phase checking method comprises the following steps:

[0019] Acquire status information of the substation, and determine whether the substation needs to be repaired according to the status information;

[0020] If the substation does not need to be overhauled, the closed busbar phase checking and phase-staggered locking parallel system in the control substation does not check the phases of the two adjacent busbars;

[0021] If the substation needs to be repaired, the closed bus phase check and phase-staggered locking parallel system in the substation is controlled to check the phases of the two adjacent bus sections to obtain the phase check results; based on the phase check results, it is determined whether the bus tie circuit breaker connecting the two adjacent bus sections is closed normally.

[0022] Preferably, determining whether the bus tie circuit breaker is normally closed according to the phase verification result includes:

[0023] If the phase checking result shows that the phases of the two adjacent busbar sections are correct, the bus tie circuit breaker connected to the two adjacent busbar sections is controlled to close normally;

[0024] If the phase check result shows that the phase of the two adjacent sections of the bus is incorrect, the bus tie circuit breaker connected to the two adjacent sections of the bus is controlled to be locked, and the connecting cables of the two adjacent sections of the bus are replaced, and the closed bus phase check and staggered phase locking parallel system in the substation is used again to check the phase of the two adjacent sections of the bus until the phase check result shows that the phase of the two adjacent sections of the bus is correct.

[0025] Preferably, the closed busbar phase checking and phase mismatching locking parallel system in the control substation performs phase checking on two adjacent sections of the busbars, and the phase checking results obtained include:

[0026] The starter module is controlled to be closed, power is applied to both ends of the coil of the contactor, the contactor is powered on, the fourth moving contact of the contactor is connected, the normally open button of the starter module is controlled to be disconnected, and the contactor still maintains the power-on action through its fourth moving contact; the three moving contacts of the contactor connected to the central connection point of the three phases in the section of the busbar to be checked are connected, and the phases on both sides of the bus tie circuit breaker are detected to obtain detection data;

[0027] If the detection data shows that the voltage magnitude and phase between the central connection points of each phase of two adjacent sections of the busbar are the same, then the voltage across the coils of the three voltage relays connected to the central connection points of the three phases in the other section of the busbar to be checked is 0, the static contacts of the three voltage relays are connected, and the moving contacts of the three voltage relays are disconnected, so that the first intermediate relay is energized and actuated, and the second intermediate relay is not energized and does not actuate; the first moving contact of the first intermediate relay is connected to display the correct indication element of the checked phase; the second moving contact of the first intermediate relay is connected, and the closing circuit of the bus tie circuit breaker is turned on, and the bus tie circuit breaker is controlled to perform closing and parallel operation;

[0028] If the detection data shows that the voltages between the central connection points of each phase of two adjacent sections of the busbar are the same in magnitude but different in phase, the three voltage relays are activated by voltage at both ends of their coils, the static contacts of the three voltage relays are disconnected, and the moving contacts of the three voltage relays are connected, so that the second intermediate relay is energized and activated, and the first intermediate relay is not energized and does not activate; the first moving contact of the second intermediate relay is connected, so that the phase error indicating element is energized and displayed; the second moving contact of the first intermediate relay and the static contact of the second intermediate relay are both disconnected, so that the closing circuit of the bus tie circuit breaker is disconnected, and the bus tie circuit breaker is controlled to perform a locking operation.

[0029] Preferably, the closed busbar phase check and phase-staggered locking parallel system in the control substation does not perform phase check on the two adjacent sections of the busbar, including: controlling the manual switch of the starter module to be disconnected, the contactor, three voltage relays, first intermediate relay and second intermediate relay of the phase lock parallel module are not energized and do not work, the closing circuit of the busbar circuit breaker is turned on through the static contact of the first intermediate relay and the static contact of the second intermediate relay, and the busbar circuit breaker is not subject to locking control when closing.

[0030] The closed busbar phase checking and phase mismatching locking parallel system and its phase checking method in the substation, the closed busbar phase checking and phase mismatching locking parallel system in the substation includes a substation and a phase checking locking parallel module, the substation includes multiple busbar sections, two adjacent busbar sections are connected through a bus tie circuit breaker, each busbar section is provided with a plurality of insulators for fixing, each phase insulator close to both sides of the bus tie circuit breaker is set as a capacitor voltage dividing insulator, and the capacitor voltage dividing insulator is provided with an external central connection point; the phase checking locking parallel module is used for phase checking of the connection phase of two adjacent busbar sections, the phase checking locking parallel module is respectively connected to the central connection point of each phase in the two busbar sections to be checked, and the phase checking locking parallel module It comprises a contactor, three voltage relays connected to the contactor, and a first intermediate relay and a second intermediate relay connected to the three voltage relays, wherein the three moving contacts of the contactor are respectively connected to the three-phase central connection points in a section of a busbar of a phase to be checked, the coils of the three voltage relays are respectively connected to the three-phase central connection points in another section of a busbar of a phase to be checked, the first end of the second moving contact of the first intermediate relay is connected to the closing circuit of a bus tie circuit breaker, the second end of the second moving contact of the first intermediate relay is connected to the closing coil of the bus tie circuit breaker, the static contact of the second intermediate relay is connected in series with the static contact of the first intermediate relay and then connected in parallel with the second moving contact of the first intermediate relay.

[0031] It can be seen from the above technical scheme that the present application has the following advantages: the closed busbar phase and phase mismatch locking parallel system in the substation is achieved by setting the insulators of each phase near both sides of the bus tie circuit breaker as capacitor voltage divider insulators, and connecting the capacitor voltage divider insulator through the central connection point of the voltage divider with the phase locking parallel module, so that the phase locking parallel module can drive the voltage relay to operate when the phase is wrong during the phase checking process, and can also connect to two adjacent busbars through the contacts of the contactor to ensure the safety and reliability of the phase checking; it solves the problem that the existing power system uses a high-voltage phase checking instrument to check the phase, and this method has the technical problem of high operating risk and unreliability.

[0032] The phase checking method of the closed bus phase checking and the phase-shifting interlocking parallel system in the substation realizes phase checking of two adjacent bus sections by controlling the operation of the closed bus phase checking and the phase-shifting interlocking parallel system in the substation. The phase checking operation is convenient, simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1It is a schematic diagram of the structure of a substation in a locked parallel system of closed busbar core phase and staggered phase in a substation according to an embodiment of the present application;

[0035] Figure 2 It is a schematic diagram of a phase detection circuit of a core phase locking parallel module in a closed bus core phase and phase mismatch locking parallel system in a substation according to an embodiment of the present application;

[0036] Figure 3 It is a schematic diagram of the control circuit of the core phase locking parallel module in the locked parallel system of the core phase and staggered phase of the closed busbar in the substation according to the embodiment of the present application;

[0037] Figure 4 A schematic diagram of circuit breaker locking and paralleling of a core phase locking and paralleling module in a locked core phase and staggered phase locking and paralleling system of a closed busbar in a substation according to an embodiment of the present application;

[0038] Figure 5 It is a flow chart of the steps of the phase checking method of the closed bus phase checking and the phase-staggered locked parallel system in the substation described in the embodiment of the present application;

[0039] Figure 6 It is a flow chart of a phase checking method of a closed busbar phase checking and phase-staggered locking parallel system in a substation according to an embodiment of the present application;

[0040] Figure 7 It is a voltage phasor diagram when the phases of two adjacent bus sections are the same in the phase checking method of the closed bus phase checking and the phase-staggered locked parallel system in the substation described in the embodiment of the present application;

[0041] Figure 8 It is a voltage phasor diagram when the phases of two adjacent bus sections are different in the phase checking method of the closed bus phase checking and the phase-staggered locked parallel system in the substation described in the embodiment of the present application;

[0042] Fig. 9 It is the three-phase phasor diagram of the existing power system;

[0043] Fig.10 It is a relationship diagram of the voltage difference between the two sides of the existing 10kV busbar circuit breaker;

[0044] Fig.11 It is the principle diagram of the high voltage core phase of the existing open line or busbar;

[0045] Fig.12 This is the main wiring diagram of the existing substation with a voltage level of 10kV.

[0046] exist Figure 7 and Figure 8In the figure, a is the voltage phasor diagram of bus section I, b is the voltage phasor diagram of bus section II, c is the voltage phasor diagram of the voltage dividing point E of bus section I, d is the voltage phasor diagram of the voltage dividing point E of bus section II, and e is the voltage phasor diagram of the voltage relays VJA, VJB, and VJC. Fig.10 In the figure, a is a relationship diagram when the phases of the fractures on both sides of the same phase are inconsistent, and b is a relationship diagram when the phases of the fractures on both sides of the same phase are consistent. DETAILED DESCRIPTION

[0047] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0049] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] The power generation, transformation, transmission and supply of the power system are all realized through the three phases a, b and c. The three-phase voltage of the symmetrical power system is equal and the phase difference is 120°. The phasor diagram is as follows: Fig. 9 shown.

[0051] In order to ensure the continuity and reliability of electrical equipment, most of them are powered by two power supplies sent to two sections of busbars or lines through the closing of the bus tie circuit breaker to run in parallel to supply power to the electrical equipment. For new, rebuilt, and expanded substations and transmission lines, as well as after line maintenance, the two power supplies are recorded as the first power supply and the second power supply respectively. When the second power supply is put into use, it is necessary to check the phase at the parallel point (on both sides of the bus tie circuit breaker). If the phase is not checked, the phase sequence (phase) may be inconsistent due to installation and wiring errors. Although the voltages on both sides of the circuit breaker are equal, the phase angles differ by 120°. At this time, if the bus tie circuit breaker is closed, the voltage difference on both sides is the line voltage ( times the phase voltage), such as Fig.10 As shown in a, since the closing contact resistance of the circuit breaker is extremely small (micro-ohm level), a huge current will be generated after closing, causing a short circuit accident. Only when the phase sequence (phase) on both sides of the circuit breaker is consistent and the voltage difference on both sides is 0, as shown in Fig.10 As shown in b, the circuit breaker can be closed and connected in parallel. Therefore, before the second power supply is connected, it is necessary to check the phase with the first power supply to ensure the correct phase sequence (phase).

[0052] For an open line or busbar with a voltage of 10 kV in a power system, the method for checking the phase of the first power supply and the second power supply is as follows: Fig.11 As shown, let the lines or busbars on both sides be energized. Before the parallel switch DL is closed, the insulating rod L1 of the high-voltage phase analyzer is used to contact point 1, and the insulating rod L2 is used to contact points 1', 2', and 3' respectively. If the indications of the microammeter μA are 0, 1, and 1 respectively (0 represents the pointer indicating 0, and 1 represents the pointer indicating), it means that a and a' are in phase. Similarly, the insulating rod L1 of the high-voltage phase analyzer is used to contact point 2, and the insulating rod L2 is used to contact points 1', 2', and 3' respectively. If the indications of the microammeter μA are 1, 0, and 1, it means that b and b' are in phase. The insulating rod L1 of the high-voltage phase analyzer is used to contact point 3, and the insulating rod L2 is used to contact points 1', 2', and 3' respectively. If the indications of the microammeter μA are 1, 1, and 0, it means that c and c' are in phase. The phase sequence of a, b, c and a', b', and c' is correct, and the switch DL can be closed and operated in parallel. If the indication of the microammeter μA is inconsistent with the above result, it means that the phases on both sides are wrong. It is necessary to cut off the power supply, adjust the phases and then check the phases again until the phases are correct.

[0053] Patent terms for this application:

[0054] Phase checking: refers to the use of instruments or other means to check whether the phases and phase sequences of two power supplies or loops are the same during electrical operations in the power system, that is, the measurement of the phase difference.

[0055] Phase-shifted interlocking parallel: When two power sources are sent to two sections of busbars or lines and run in parallel through the bus tie circuit breaker, if the phases of the two power sources are inconsistent, the bus tie circuit breaker will be closed in parallel, which will cause a short circuit accident. Phase-shifted interlocking parallel means that the relevant relay contacts are connected in series in the closing circuit of the bus tie circuit breaker. When the phases of the two power sources are inconsistent, the contacts are disconnected to prevent the bus tie circuit breaker from closing by mistake and causing an accident.

[0056] The embodiment of the present application provides a closed busbar phase checking and phase-staggered locking parallel system and phase checking method in a substation, which solves the technical problem that the existing power system uses a high-voltage phase checking instrument to check the phase, but this method has high operating risks and is unreliable.

[0057] Embodiment 1:

[0058] Figure 1 This is a schematic diagram of the structure of a substation in a locked parallel system of a closed busbar core phase and staggered phase in a substation according to an embodiment of the present application. Figure 2 This is a schematic diagram of a phase detection circuit of a core phase locking parallel module in a closed bus core phase and phase mismatch locking parallel system in a substation according to an embodiment of the present application, Figure 3 This is a schematic diagram of a control circuit of a core phase locking parallel module in a closed bus core phase and staggered phase locking parallel system in a substation according to an embodiment of the present application, Figure 4 It is a schematic diagram of circuit breaker locking and paralleling of the core phase locking and paralleling module in the locked paralleling system of the core phase and staggered phase of the closed bus in the substation described in the embodiment of the present application.

[0059] like Figures 1 to 4 As shown, an embodiment of the present application provides a closed busbar core phase and staggered phase locking parallel system in a substation, including a substation and a core phase locking parallel module.

[0060] In the embodiment of the present application, the substation includes multiple busbars, two adjacent busbars are connected by a bus tie circuit breaker 500, and a plurality of insulators 100 for fixing are arranged on each busbar, and each phase insulator 100 near both sides of the bus tie circuit breaker 500 is a capacitor voltage divider insulator, and the capacitor voltage divider insulator is provided with an external central connection point E. The capacitor voltage divider insulator includes a main capacitor C1 and a voltage divider capacitor C2 connected in series, and the node where the main capacitor C1 and the voltage divider capacitor C2 are connected is used as the central connection point E.

[0061] It should be noted that if Figure 1As shown, each phase of each section of the 10kV enclosed busbar of the substation is fixed by a plurality of supporting insulators 100, and the two ends of the supporting insulators 100 are respectively connected to the busbar and the channel steel 101 (grounding), and a certain distance is maintained between the phases to ensure that the busbar is fixed and the high-voltage part has a sufficient safety distance between the phases and the ground. In this embodiment, the insulators 100 closest to the upper and lower breaks of each phase on both sides of the bus tie circuit breaker 500 are set as capacitor voltage divider insulators (6 for three phases), and the capacitor voltage divider insulators are composed of a main capacitor C1 and a voltage divider capacitor C2 in series. The main capacitor C1 and the voltage divider capacitor C2 of the 6 capacitor voltage divider insulators are selected with the same parameters, and the middle connection between the main capacitor C1 and the voltage divider capacitor C2 is led to the central connection point E.

[0062] like Figures 2 to 4 As shown, in the embodiment of the present application, the core phase locking parallel module is used to perform core phase detection on the connection phases of two adjacent bus sections, and the core phase locking parallel module is respectively connected to the center connection point E of each phase in the two bus sections to be cored, and the core phase locking parallel module includes a contactor KM, three voltage relays VJ connected to the contactor KM, and a first intermediate relay ZA and a second intermediate relay ZB connected to the three voltage relays VJ. The three moving contacts of the contactor KM are respectively connected to the three-phase center connection point E in a bus section to be cored, The coils of the three voltage relays VJ are respectively connected to the three-phase center connection point E in another section of the busbar to be checked, the first end of the second moving contact ZA2 of the first intermediate relay ZA is connected to the closing circuit of the bus tie circuit breaker 500, the second end of the second moving contact ZA2 of the first intermediate relay ZA is connected to the closing coil of the bus tie circuit breaker 500, the static contact ZB3 of the second intermediate relay ZB is connected in series with the static contact ZA3 of the first intermediate relay ZA and then connected in parallel with the second moving contact ZA2 of the first intermediate relay ZA.

[0063] It should be noted that if Figures 1 to 4 As shown, two adjacent busbar sections are taken as examples through a bus tie circuit breaker 500. The two adjacent busbar sections are respectively recorded as busbar section I and busbar section II. The three phases of busbar section I are recorded as phase a, phase b and phase c, and the central connection points of the corresponding phases are recorded as Ea, Eb and Ec respectively; the three phases of busbar section II are recorded as phase a', phase b' and phase c', and the central connection points of the corresponding phases are recorded as Ea', Eb' and Ec' respectively. Figure 2As shown, the three moving contacts of the contactor KM are KM1, KM2 and KM3. The three voltage relays VJ are respectively recorded as voltage relay VJA, voltage relay VJB and voltage relay VJC. The first end of the moving contact KM1 of the contactor KM is connected to the central connection point Ec, the second end of the moving contact KM1 of the contactor KM is connected to the coil of the voltage relay VJC, and the coil of the voltage relay VJC is also connected to the central connection point Ec'; the first end of the moving contact KM2 of the contactor KM is connected to the central connection point Eb, the second end of the moving contact KM2 of the contactor KM is connected to the coil of the voltage relay VJB, and the coil of the voltage relay VJB is also connected to the central connection point Eb'; the first end of the moving contact KM3 of the contactor KM is connected to the central connection point Ea, the second end of the moving contact KM3 of the contactor KM is connected to the coil of the voltage relay VJA, and the coil of the voltage relay VJA is also connected to the central connection point Ea'.

[0064] In the embodiment of the present application, the 10kV closed busbar of the substation is taken as an example, and the voltage U of each relative voltage of the 10kV voltage level is 相 for:

[0065]

[0066] If the voltage of the main capacitor C1 is selected as 6000V, the capacitance value of the main capacitor C1 is selected as 25Pf; the voltage of the voltage-dividing capacitor C2 is selected as 200V, and the capacitance value of the voltage-dividing capacitor C2 is selected as 1500Pf. After the main capacitor C1 and the voltage-dividing capacitor C2 are connected in series to each 10kV bus in each phase of each bus section, the voltage U at the central connection point E of the capacitor voltage divider to the ground is E for:

[0067]

[0068] The voltage relay VJ is connected to the central connection point E of the voltage-dividing capacitor insulator of the upper and lower breaks of the bus tie circuit breaker 500 through its own coil. When the moving contacts KM1, KM2, and KM3 of the contactor KM are closed, the phases on both sides of the bus tie circuit breaker 500 are the same, and the voltage across the voltage relay VJ is 0. When the phases on both sides of the bus tie circuit breaker 500 are different, the voltage across the voltage relay VJ is:

[0069]

[0070] Therefore, in order to enable the contactor KM to operate reliably under this voltage (such as the voltage across the voltage relay VJ), the starting voltage of the voltage relay VJ is selected as 150V, and the contactor KM, the first intermediate relay ZA, and the second intermediate relay ZB are all connected to an AC 220V power supply. In order to enable the contactor KM to operate reliably under this voltage, the starting voltage of the first intermediate relay ZA and the second intermediate relay ZB is selected as 200V.

[0071] It should be noted that the closed busbar core phase and staggered phase locking parallel system in the substation can isolate the core phase locking parallel module from the high voltage by reasonably selecting the parameters of the main capacitor C1 and the voltage-dividing capacitor C2. There is no need to contact the high-voltage equipment. The core phase can be safely and reliably controlled through the closed busbar core phase and staggered phase locking parallel system in the substation. There is no need to manually open the insulating baffle of the substation, nor is there a need for multiple people to lift insulating rods to operate, which will not cause the safety risks of electric shock and relative short circuit.

[0072] In the embodiment of the present application, the locked parallel system for closed bus phase and phase mismatch in the substation selects the insulator closest to the upper and lower breaks of the bus tie circuit breaker as a capacitor voltage divider insulator. According to the voltage division principle, the size of the main capacitor and the voltage divider capacitor is reasonably selected so that the voltage value drawn through the central connection point of the voltage divider is of appropriate size. On the one hand, when the connection phase of two adjacent bus sections is wrong, the voltage relay can be driven to operate. On the other hand, the safety of the first intermediate relay and the second intermediate relay circuit can be controlled through the contactor contacts, thereby solving the problem of difficulty in closing the bus phase.

[0073] The present application provides a closed busbar phase and phase mismatch locking parallel system in a substation, including a substation and a phase-locking parallel module. The substation includes multiple busbar sections, two adjacent busbar sections are connected through a bus tie circuit breaker, and each busbar section is provided with a plurality of insulators for fixing. The insulators of each phase close to both sides of the bus tie circuit breaker are configured as capacitor voltage-dividing insulators, and the capacitor voltage-dividing insulators are provided with an external central connection point; the phase-locking parallel module is used to perform phase detection on the connection phase of two adjacent busbar sections, and the phase-locking parallel module is respectively connected to the central connection point of each phase in the two busbar sections to be phase-checked, and the phase-locking parallel module includes a contactor, and a contactor. The three voltage relays connected and the first intermediate relay and the second intermediate relay connected to the three voltage relays, the three moving contacts of the contactor are respectively connected to the three-phase center connection point in a section of the busbar of the phase to be checked, the coils of the three voltage relays are respectively connected to the three-phase center connection point in another section of the busbar of the phase to be checked, the first end of the second moving contact of the first intermediate relay is connected to the closing circuit of the bus tie circuit breaker, the second end of the second moving contact of the first intermediate relay is connected to the closing coil of the bus tie circuit breaker, the static contact of the second intermediate relay is connected in series with the static contact of the first intermediate relay and then connected in parallel with the second moving contact of the first intermediate relay. The closed busbar phase checking and phase mismatch locking parallel system in the substation is achieved by setting the insulators of each phase near both sides of the bus tie circuit breaker as capacitor voltage-dividing insulators, and connecting the central connection point of the voltage division of the capacitor voltage-dividing insulator to the phase checking locking parallel module, so that the phase checking locking parallel module can drive the voltage relay to operate when the phase is wrong during the phase checking process, and can also connect to two adjacent busbars through the contacts of the contactor, so as to ensure the safety and reliability of the phase checking; it solves the technical problem that the existing power system uses a high-voltage phase checking instrument to check the phase, and this method has high operating risks and is unreliable.

[0074] like Figure 3As shown, in one embodiment of the present application, the nuclear phase locking parallel module includes a starter module, a connection node C, a nuclear phase correct indication element LD2, a nuclear phase error indication element LD3 and a power supply, the first end of the coil of the contactor KM is connected to the connection node C, the connection node C is connected to the positive pole A of the power supply through the starter module, and the second end of the coil in the contactor KM is connected to the negative pole O of the power supply; the static contacts VJA1, VJB1, and VJC1 of the three voltage relays VJ are connected in series in sequence and connected between the connection node C and the coil of the first intermediate relay ZA; the moving contacts VJA2, VJB2, and VJC2 of the three voltage relays VJ are connected in parallel and connected between the connection node C and the coil of the second intermediate relay ZB; the first moving contact ZA1 of the first intermediate relay ZA is connected in series with the nuclear phase correct indication element LD2 and connected between the connection node C and the negative pole of the power supply, and the first moving contact ZB1 of the second intermediate relay ZB is connected in series with the nuclear phase error indication element LD3 and connected between the connection node C and the negative pole of the power supply. The starter module includes a normally open button SA and a manual switch KK. The normally open button SA and the manual switch KK are connected in series and are respectively connected to the positive pole A of the power supply and the connection node C. Both ends of the manual switch KK are connected in parallel with the fourth moving contact KM4 of the contactor KM.

[0075] It should be noted that the power supply can be selected as 220V AC. Both the phase correct indication element LD2 and the phase error indication element LD3 are indicator signs, display screens or light-emitting elements. In this embodiment, the phase lock parallel module includes a phase work indication element LD1, one end of which is connected to the normally open button SA and the manual switch KK respectively, and the other end of which is connected to the negative pole O of the power supply. The phase lock parallel module includes a sound element SPK, the first end of which is connected to the first moving contact ZB1 of the second intermediate relay ZB and the phase error indication element LD3 respectively, and the second end of which is connected to the negative pole O of the power supply. Among them, the sound element SPK is a speaker. The phase of the closed bus phase and the phase-wrong locking parallel system in the substation is simple and fast. When the manual switch KK is closed, as long as the normally open button SA is pressed, the phase check result can be instantly obtained through the information of the phase correct indication element LD2 or the phase error indication element LD3 and the alarm sound element SPK. The closed bus phase check and phase mismatch locking parallel system in the substation can automatically lock the closing operation circuit of the bus tie circuit breaker when the phases of the two bus sections are inconsistent according to the phase check results, thereby preventing power accidents caused by human error. The closed bus phase check and phase mismatch locking parallel system in the substation can check the phase, so that the phase check operators do not need to wear insulating gloves and insulating boots to use high-voltage phase check rods to contact high-voltage equipment, which greatly reduces safety risks and improves work efficiency.

[0076] In the embodiment of the present application, the excitation coil of the contactor KM is connected in parallel with its own fourth moving contact KM4 and the normally open button SA, and then connected in series with the manual switch KK to the AC 220V power supply. The excitation coil of the first intermediate relay ZA is connected in series with the static contacts VJA1, VJB1, and VJC1 of the three-phase voltage relay VJA, voltage relay VJB, and voltage relay VJC, respectively, and then connected in parallel with the excitation coil of the contactor KM. The moving contacts VJA2, VJB2, and VJC2 of the three-phase voltage relay VJA, voltage relay VJB, and voltage relay VJC are connected in parallel with the excitation coil of the intermediate relay ZB, and then connected in series with the excitation coil of the contactor KM. The first moving contact ZA1 of the first intermediate relay ZA is connected in series with the nuclear phase correct indication element LD2 and the resistor R2, and then connected in parallel with the excitation coil of the contactor KM. The phase error indicating element LD3 and the resistor R3 are connected in series with the sounding element SPK and the resistor R4, and then connected in parallel with the first moving contact ZB1 of the second intermediate relay ZB, and then connected in parallel with the excitation coil of the contactor KM. The three pairs of moving contacts KM1, KM2, and KM3 of the contactor KM are connected in series with the excitation coils of the phase voltage relays VJA, VJB, and VJC, respectively, and connected between the voltage dividing points EaEa', EbEb', and EcEc' of the three-phase capacitor voltage dividing insulators on both sides of the bus tie circuit breaker 500.

[0077] Embodiment 2:

[0078] Figure 5 It is a flow chart of the steps of the phase checking method of the closed bus phase checking and the phase-staggered locked parallel system in the substation described in the embodiment of the present application.

[0079] like Figure 5 As shown, the embodiment of the present application provides a phase checking method for a closed busbar phase checking and a phase-staggered locking parallel system in a substation, which is applied to the above-mentioned closed busbar phase checking and phase-staggered locking parallel system in the substation, and the phase checking method includes the following steps:

[0080] S1. Obtain status information of the substation and determine whether the substation needs to be repaired based on the status information.

[0081] It should be noted that the contents of the closed busbar core phase and staggered phase locking parallel system in the substation have been described in the first embodiment, and the contents of the closed busbar core phase and staggered phase locking parallel system in the substation will not be repeated in this embodiment. In this embodiment, the status information is the information of the new construction, reconstruction or expansion of the substation, and the main transformer, cable and other equipment of the substation need to be repaired, such as Figure 1After the 10kV I and II busbars are energized, before closing the busbar tie breaker 500 to connect the two busbars in parallel, the phases must be checked on both sides of the busbar tie breaker 500 to prevent short circuit accidents caused by inconsistent phases of the two busbars. The status information is not information about the construction, reconstruction or expansion of the substation, and there is no need to overhaul the main transformer, cables and other equipment of the substation.

[0082] S2. If the substation does not need to be repaired, the closed busbar phase check and phase-staggered interlocking parallel system in the control substation will not check the phases of the two adjacent busbars.

[0083] It should be noted that the control of the closed bus phase and phase mismatch locking parallel system in the substation without phase checking of the two adjacent bus sections includes: the manual switch of the control starter module is disconnected, the contactor, three voltage relays, first intermediate relay and second intermediate relay of the phase locking parallel module are not powered and do not work, the closing circuit of the bus tie circuit breaker is connected through the static contact of the first intermediate relay and the static contact of the second intermediate relay, and the bus tie circuit breaker is not subject to locking control when closing. In this embodiment, when the phase checking operation is not required, the manual switch KK is controlled to be disconnected, all components in the phase locking parallel module are not powered, the three moving contacts KM1, KM2, and KM3 of the contactor are disconnected, the voltages at both ends of the three voltage relays VJA, VJB, and VJC are all 0, and the three voltage relays VJA, VJB, and VJC do not operate. Point G of the closing circuit of the bus tie circuit breaker 500 is connected to point H through the static contact ZA3 of the first intermediate relay ZA and the static contact ZB3 of the second intermediate relay ZB, that is, the bus tie circuit breaker 500 is not locked when closed. The static contact ZA3 of the first intermediate relay ZA is connected in series with the static contact ZB3 of the second intermediate relay ZB and then connected in parallel with the second moving contact ZA2 of the first intermediate relay ZA to the closing circuit of the bus tie circuit breaker 500; when the phase check is not performed, the first intermediate relay ZA and the second intermediate relay ZB do not act, the static contacts ZA3 and ZB3 are closed, and the closing circuit of the bus tie circuit breaker 500 is connected, that is, the closing of the bus tie circuit breaker 500 is not locked.

[0084] S3. If the substation needs to be repaired, the closed bus phase check and staggered phase locking parallel system in the substation is controlled to check the phases of the two adjacent bus sections to obtain the phase check results; based on the phase check results, it is determined whether the bus tie circuit breaker connecting the two adjacent bus sections is closed normally.

[0085] It should be noted that step S3 performs maintenance on the substation as needed, and controls the closed bus phase check and staggered phase locking parallel system in the substation to check the phases of the two adjacent bus sections, obtain the phase check results, and determine whether the bus tie circuit breaker connecting the two adjacent bus sections is closed normally. In this embodiment, when the phase check operation is required, the manual switch KK is turned on, and the normally open button SA is pressed. The 220V AC power supply is applied to both ends of the excitation coil of the contactor KM through the manual switch KK and the normally open button SA, and all the moving contacts of the contactor KM are energized and actuated. The fourth moving contact KM4 of the contactor KM is turned on. At this time, the normally open button SA is released, and the 220V AC power supply is applied to both ends of the excitation coil of the contactor KM through the manual switch KK and the fourth moving contact KM4 of the contactor KM, that is, the contactor KM still maintains the energized action through its own fourth moving contact KM4; the moving contacts KM1, KM2, and KM3 of the contactor KM are turned on, and the phases of both sides (i.e., busbars I and II) of the bus tie circuit breaker 500 are detected, and both ends of the three voltage relays VJA, VJB, and VJC of the three phases are connected to the central connection point E of the voltage division of the capacitive voltage divider insulator of the upper and lower breaks of the bus tie circuit breaker 500.

[0086] Figure 6 It is a flow chart of a phase checking method for a closed busbar phase checking and a phase-staggered locked parallel system in a substation as described in an embodiment of the present application.

[0087] like Figure 6 As shown, in the embodiment of the present application, determining whether the bus tie circuit breaker is normally closed according to the phase checking result includes:

[0088] If the phase checking result shows that the phases of the two adjacent busbars are correct, the busbar tie breaker connected to the two adjacent busbars is controlled to close normally;

[0089] If the phase check result shows that the phase of the two adjacent bus sections is incorrect, the bus tie circuit breaker connected to the two adjacent bus sections will be controlled to be locked, and the connecting cables of the two adjacent bus sections will be replaced. The closed bus phase check and staggered phase locking parallel system in the substation will be used to re-check the phase of the two adjacent bus sections until the phase check result shows that the phase of the two adjacent bus sections is correct.

[0090] In an embodiment of the present application, the phase checking method of the closed bus phase checking and the phase-staggered interlocking parallel system in the substation controls the operation of the closed bus phase checking and the phase-staggered interlocking parallel system in the substation to realize the phase checking of two adjacent bus sections. The phase checking operation is convenient, simple and practical.

[0091] In the embodiment of the present application, the closed busbar phase checking and phase mismatching locking parallel system in the control substation checks the phases of two adjacent busbars, and the phase checking results obtained include:

[0092] The control starter module is closed, power is applied to both ends of the contactor coil, the contactor is powered, the fourth moving contact of the contactor is connected, the normally open button of the control starter module is disconnected, and the contactor still maintains power through its fourth moving contact; the three moving contacts of the contactor connected to the three-phase center connection point in the bus section to be checked are connected, and the phases on both sides of the bus tie circuit breaker are detected to obtain detection data;

[0093] If the detection data shows that the voltage magnitude and phase between the central connection points of each phase of two adjacent busbar sections are the same, then the voltage across the coils of the three voltage relays connected to the central connection points of the three phases in the other busbar section to be checked is 0, the static contacts of the three voltage relays are connected, and the moving contacts of the three voltage relays are disconnected, so that the first intermediate relay is energized and actuated, and the second intermediate relay is not energized and does not actuate; the first moving contact of the first intermediate relay is connected to make the correct indicating element of the checked phase to display with power; the second moving contact of the first intermediate relay is connected, and the closing circuit of the busbar circuit breaker is turned on, and the busbar circuit breaker is controlled to perform closing and parallel operation;

[0094] If the detection data shows that the voltages between the central connection points of each phase of two adjacent busbar sections are the same in magnitude but different in phase, there is voltage at both ends of the coils of the three voltage relays and they will operate, the static contacts of the three voltage relays will be disconnected, and the moving contacts of the three voltage relays will be connected, so that the second intermediate relay will operate upon power, and the first intermediate relay will not operate without power; the first moving contact of the second intermediate relay will be connected, so that the phase error indicating element will display with power; the second moving contact of the first intermediate relay and the static contact of the second intermediate relay will be disconnected, so that the closing circuit of the bus tie circuit breaker will be disconnected, and the bus tie circuit breaker will be controlled to perform the locking operation.

[0095] It should be noted that when the phases of both sides of the bus tie circuit breaker 500 (i.e., busbars I and II) are correct, when the voltage magnitudes and phases between the terminals EaEa', EbEb', and EcEc' are the same, the voltages at both ends of the three voltage relays VJA, VJB, and VJC of the three phases are 0, and none of them operates. The static contacts VJA1, VJB1, and VJC1 of the three voltage relays VJA, VJB, and VJC of the three phases are connected, and the three voltage relays VJA, VJB, and VJC of the three phases are connected. B. The moving contacts VJA2, VJB2, and VJC2 of VJC are disconnected, so that the first intermediate relay ZA is energized and actuated; while the second intermediate relay ZB is not energized and does not actuate; the first moving contact ZA1 of the first intermediate relay ZA connects the circuit of the correct phase indicator element, and the correct phase indicator element is energized and displayed; at the same time, the second moving contact ZA2 of the first intermediate relay ZA connects the closing circuit of the bus tie circuit breaker 500, and the bus tie circuit breaker 500 can be closed and operated in parallel. When the phases of the two sides of the bus tie circuit breaker 500 (i.e., busbars Ⅰ and Ⅱ) are incorrect, when the voltages between the terminals EaEa', EbEb', and EcEc' are the same in magnitude but different in phase, the three voltage relays VJA, VJB, and VJC of the three phases are energized and actuated. Figure 8 In the process, the static contacts VJA1, VJB1, VJC1 of the voltage relays VJA, VJB, VJC are disconnected, while the moving contacts VJA2, VJB2, VJC2 of the three-phase voltage relays VJA, VJB, VJC are connected, so that the first intermediate relay ZB is energized and actuated; while the first intermediate relay ZA is not energized and does not actuate; the moving contact ZB1 of the second intermediate relay ZB connects the circuit of the nuclear phase error indicating element, and the nuclear phase error indicating element is energized and displayed; at the same time, the sounding element SPK emits an alarm tone, and the second moving contact ZA2 of the first intermediate relay ZA and the static contact ZB3 of the second intermediate relay ZB are both disconnected, so that the closing circuit of the bus tie circuit breaker 500 is disconnected, and the closing operation of the bus tie circuit breaker 500 is locked, that is, when the phases of the two bus sections are different, it prevents the operator from mistakenly closing the bus tie circuit breaker 500 to avoid operating accidents.

[0096] Figure 7 The voltage phasor diagram is when the phases of two adjacent bus sections are the same in the phase checking method of the closed bus phase checking and the phase-staggered locked parallel system in the substation described in the embodiment of the present application, Figure 8 It is a voltage phasor diagram when the phases of two adjacent bus sections are different in the phase checking method of the closed bus phase checking and staggered locked parallel system in the substation described in the embodiment of the present application.

[0097] In the embodiment of the present application, if the phases of a, b, and c of bus section I are the same as those of a', b', and c' of bus section II, the voltage after capacitor voltage division is , , Respectively , , The magnitude and direction are the same, and the phasor diagram analysis is as follows Figure 7 As shown, the voltage across the voltage relays VJA, VJB, and VJC is 0, and the relays do not operate. One end of the 220V AC power source passes through the manual switch KK, through point B, the fourth moving contact KM4, the connection node C, the static contact VJA1, the static contact VJB1, and the static contact VJC1 to point D, so that the first intermediate relay ZA is energized and operates, and the moving contact of the first intermediate relay ZA1 is closed, connecting the nuclear phase correct indication element branch, so that the nuclear phase correct indication element is energized and displayed. The moving contacts VJA2, VJB2, and VJC2 of the voltage relay are disconnected, so that the second intermediate relay ZB is not energized, the moving contact ZB1 of the second intermediate relay is disconnected, and the nuclear phase correct indication element branch is not energized. At this time, the G point of the closing circuit of the mother tie circuit breaker 500 is connected to point H through the second moving contact ZA2 of the first intermediate relay ZA, and the nuclear phase correct indication element is not locked and closed normally.

[0098] In the embodiment of the present application, if the phases of a, b, and c of bus section I are different from those of a', b', and c' of bus section II, assuming that a and a' are in phase, but b and b', and c and c' are different, the phases of the capacitor voltage divider insulator after the capacitor voltage divider insulator are different. and are the same in size and direction, and , Respectively , The magnitudes are the same, but the directions differ by 120°. The phasor diagram analysis is as follows: Figure 8 As shown. The voltage across the voltage relay VJA of phase a is 0, while the voltage across the voltage relay VJB of phase b and the voltage relay VJC of phase c are: ; The voltage relay VJA of phase a does not operate, the voltage relay VJB of phase b and the voltage relay VJC of phase c operate, the moving contacts of the voltage relay VJB of phase b and the voltage relay VJC of phase c are closed, one end of the 220V AC power supply passes through the manual switch KK, point B, the fourth moving contact KM4 of the contactor KM, the connection node C, the moving contact VJB2 of the voltage relay VJB of phase b and the moving contact VJC2 of the voltage relay VJC of phase c to point F, the second intermediate relay ZB is energized and operates, the moving contact ZB1 of the second intermediate relay is closed, the nuclear phase error indication element branch is connected, the nuclear phase error indication element is energized and displayed, and at the same time the sounding element SPK emits an alarm sound. At this time, point G of the closing circuit of the bus tie circuit breaker 500 is disconnected through the second moving contact ZA2 of the first intermediate relay ZA, and in the branch of the static contact ZA3 of the first intermediate relay ZA and the static contact ZB3 of the second intermediate relay ZB, the second intermediate relay ZB is actuated, the static contact ZB3 of the second intermediate relay ZB is disconnected, and the closing coil circuit of the bus tie circuit breaker 500 is disconnected. At this time, if the operator mistakenly closes the bus tie circuit breaker 500, the circuit breaker cannot be closed because the closing circuit is connected in series with the contact of the second intermediate relay ZB, that is, the two parallel bus sections of the bus tie circuit breaker 500 are locked when the phase is wrong.

[0099] In the embodiment of the present application, if the phases of a, b, c of bus section I are different from the phases of a', b', c' of bus section II, the capacitor voltage divider insulator will and , and , and The magnitudes are the same, but the directions differ by 120°. The voltages across the three-phase voltage relays VJA, VJB, and VJC are: The three-phase voltage relays VJA, VJB, and VJC are activated, and the moving contacts of the three-phase voltage relays VJA, VJB, and VJC are closed. One end of the 220V AC power supply passes through the manual switch KK, point B, the fourth moving contact KM4 of the contactor KM, the connection node C, the moving contacts VJA2, VJB2, and VJC2 of the three-phase voltage relays VJA, VJB, and VJC to point F. The second intermediate relay ZB is energized and activated, and the moving contact ZB1 of the second intermediate relay ZB is closed, connecting the nuclear phase error indication element branch, so that the nuclear phase error indication element is energized and displayed, and at the same time, the sounding element SPK emits an alarm sound. The G point of the closing circuit of the bus tie circuit breaker 500 is disconnected through the moving contact ZA2 of the first intermediate relay ZA, and in the branch of the static contact ZA3 of the first intermediate relay ZA and the static contact ZB3 of the second intermediate relay ZB, the second intermediate relay ZB is actuated, the static contact ZB3 of the second intermediate relay ZB is disconnected, the closing coil circuit of the bus tie circuit breaker 500 is disconnected, and the bus tie circuit breaker 500 is locked. When the phase error is detected, the three-phase phase of the main transformer low-voltage cable needs to be replaced again until the detection is correct. U AA' is the voltage across the voltage relay VJA, U aa' The distance between busbar section I and busbar section II a Phase voltage, U BB' is the voltage across the voltage relay VJB, U bb' The distance between busbar section I and busbar section II b Phase voltage, U CC' is the voltage across the voltage relay VJC, U cc' The distance between busbar section I and busbar section II c Phase voltage.

[0100] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0101] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0102] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0103] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0104] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A closed busbar core phase and staggered phase locking parallel system in a substation, characterized in that: include: A substation, wherein the substation comprises a plurality of busbar sections, two adjacent busbar sections are connected by a busbar tie breaker, a plurality of insulators for fixing are arranged on each busbar section, and the insulators of each phase close to both sides of the busbar tie breaker are arranged as capacitor voltage-dividing insulators, and the capacitor voltage-dividing insulators are provided with an external central connection point; A phase-locking parallel module is used to perform phase-locking detection on the connection phases of two adjacent busbar sections. The phase-locking parallel module is respectively connected to the central connection point of each phase in the two busbar sections to be checked. The phase-locking parallel module includes a contactor, three voltage relays connected to the contactor, and a first intermediate relay and a second intermediate relay connected to the three voltage relays. The three moving contacts of the contactor are respectively connected to the central connection point of the three phases in one section of the busbar to be checked. The coils of the three voltage relays are respectively connected to the central connection point of the three phases in another section of the busbar to be checked. The first end of the second moving contact of the first intermediate relay is connected to the closing circuit of the bus tie breaker. The second end of the second moving contact of the first intermediate relay is connected to the closing coil of the bus tie breaker. The static contact of the second intermediate relay is connected in series with the static contact of the first intermediate relay and then connected in parallel with the second moving contact of the first intermediate relay. The core phase locking parallel module includes a starter module, a connection node, a core phase correct indication element, a core phase error indication element and a power supply. The first end of the coil of the contactor is connected to the connection node, and the connection node is connected to the positive electrode of the power supply through the starter module. The second end of the coil in the contactor is connected to the negative electrode of the power supply; the static contacts of the three voltage relays are connected in series in sequence and connected between the connection node and the coil of the first intermediate relay; the moving contacts of the three voltage relays are connected in parallel and connected between the connection node and the coil of the second intermediate relay; the first moving contact of the first intermediate relay is connected in series with the core phase correct indication element and connected between the connection node and the negative electrode of the power supply, and the first moving contact of the second intermediate relay is connected in series with the core phase error indication element and connected between the connection node and the negative electrode of the power supply.

2. The closed busbar core phase and staggered phase locking parallel system in the substation according to claim 1 is characterized in that: The capacitive voltage-dividing insulator comprises a main capacitor and a voltage-dividing capacitor connected in series, and a node where the main capacitor and the voltage-dividing capacitor are connected serves as a central connection point.

3. The closed busbar core phase and staggered phase locking parallel system in a substation according to claim 1, characterized in that: The phase verification correct indication element and the phase verification error indication element are both indication signs, display screens or light-emitting elements.

4. The closed busbar core phase and staggered phase locking parallel system in a substation according to claim 1, characterized in that: The starter module includes a normally open button and a manual switch. The normally open button and the manual switch are connected in series and are respectively connected to the positive electrode of the power supply and the connection node. Both ends of the manual switch are connected in parallel to the fourth moving contact of the contactor.

5. The closed busbar core phase and staggered phase locking parallel system in the substation according to claim 4, characterized in that: The nuclear phase locking parallel module includes a nuclear phase working indication element, one end of which is respectively connected to the normally open button and the manual switch, and the other end of which is connected to the negative pole of the power supply.

6. A phase checking method for a closed busbar phase checking and phase-staggered interlocking parallel system in a substation, applied to the closed busbar phase checking and phase-staggered interlocking parallel system in a substation as claimed in any one of claims 1 to 5, characterized in that: The nuclear phase method comprises the following steps: Acquire status information of the substation, and determine whether the substation needs to be repaired according to the status information; If the substation does not need to be overhauled, the closed busbar phase checking and phase-staggered locking parallel system in the control substation does not check the phases of the two adjacent busbars; If the substation needs to be repaired, the closed bus phase check and phase-staggered locking parallel system in the substation is controlled to check the phases of the two adjacent bus sections to obtain the phase check results; based on the phase check results, it is determined whether the bus tie circuit breaker connecting the two adjacent bus sections is closed normally.

7. The method for checking the phase of a closed busbar and a phase-staggered locking parallel system in a substation according to claim 6, characterized in that: Determining whether the bus tie circuit breaker is closed normally according to the phase verification result includes: If the phase checking result shows that the phases of the two adjacent busbar sections are correct, the bus tie circuit breaker connected to the two adjacent busbar sections is controlled to close normally; If the phase check result shows that the phase of the two adjacent sections of the bus is incorrect, the bus tie circuit breaker connected to the two adjacent sections of the bus is controlled to be locked, and the connecting cables of the two adjacent sections of the bus are replaced, and the closed bus phase check and staggered phase locking parallel system in the substation is used again to check the phase of the two adjacent sections of the bus until the phase check result shows that the phase of the two adjacent sections of the bus is correct.

8. The method for checking the phase of a closed busbar and a phase-staggered locking parallel system in a substation according to claim 6, characterized in that: The interlocking parallel system for controlling the phase check and phase mismatch of the closed busbar in the substation checks the phases of the two adjacent sections of the busbars, and the phase check results include: The starter module is controlled to be closed, power is applied to both ends of the coil of the contactor, the contactor is powered on, the fourth moving contact of the contactor is connected, the normally open button of the starter module is controlled to be disconnected, and the contactor still maintains the power-on action through its fourth moving contact; the three moving contacts of the contactor connected to the three-phase center connection point in the section of the busbar to be checked are connected, and the phases on both sides of the bus tie circuit breaker are detected to obtain detection data; If the detection data shows that the voltage magnitude and phase between the central connection points of each phase of two adjacent sections of the busbar are the same, then the voltage across the coils of the three voltage relays connected to the central connection points of the three phases in the other section of the busbar to be checked is 0, the static contacts of the three voltage relays are connected, and the moving contacts of the three voltage relays are disconnected, so that the first intermediate relay is energized and actuated, and the second intermediate relay is not energized and does not actuate; the first moving contact of the first intermediate relay is connected to display the correct indication element of the checked phase; the second moving contact of the first intermediate relay is connected, and the closing circuit of the bus tie circuit breaker is turned on, and the bus tie circuit breaker is controlled to perform closing and parallel operation; If the detection data shows that the voltages between the central connection points of each phase of two adjacent sections of the busbar are the same in magnitude but different in phase, the three voltage relays are activated by voltage at both ends of their coils, the static contacts of the three voltage relays are disconnected, and the moving contacts of the three voltage relays are connected, so that the second intermediate relay is energized and activated, and the first intermediate relay is not energized and does not activate; the first moving contact of the second intermediate relay is connected, so that the phase error indicating element is energized and displayed; the second moving contact of the first intermediate relay and the static contact of the second intermediate relay are both disconnected, so that the closing circuit of the bus tie circuit breaker is disconnected, and the bus tie circuit breaker is controlled to perform a locking operation.

9. The method for checking the phase of a closed busbar and a phase-staggered locking parallel system in a substation according to claim 6, characterized in that: The control system for controlling the phase checking and phase mismatch of the closed busbar in the substation and the locking parallel system not to perform phase checking on the two adjacent sections of the busbar includes: controlling the manual switch of the starter module to be disconnected, the contactor, three voltage relays, the first intermediate relay and the second intermediate relay of the phase checking locking parallel module are not energized and do not work, the closing circuit of the busbar circuit breaker is turned on through the static contact of the first intermediate relay and the static contact of the second intermediate relay, and the busbar circuit breaker is not subject to locking control when closing.

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