Phase sequence adjustment method based on double-circuit layered cable terminal steel pipe pole

Abstract

The application provides a phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole, two single-circuit overhead lines are erected in parallel, wires are arranged horizontally, a first circuit is an upper circuit, a second circuit is a lower circuit, the phase sequence of the first circuit is different from that of the second circuit; when the first circuit operates in an overhead mode and the second circuit operates in a cable mode, the second circuit is led down to a cable terminal head of the cable terminal steel pipe pole through a cross arm on the cable terminal steel pipe pole, the phase sequence of the cable terminal head on the cable terminal steel pipe pole is the same as that of the second circuit; when the second circuit is withdrawn from the cable mode and the first circuit operates in the cable mode, the first circuit is led down to the cable terminal head of the cable terminal steel pipe pole through the cross arm on the cable terminal steel pipe pole, the phase sequence of the cable terminal head on the cable terminal steel pipe pole corresponds to that of a cable terminal head of a tower corresponding to the other end of the cable; the application solves the problem that the cable terminal head cannot be replaced and reused after being connected with the cable, and investment is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power engineering, in particular to a phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole. BACKGROUND

[0002] The statements in this section merely provide background technology related to the present application and do not necessarily constitute prior art.

[0003] In the construction process of 220KV overhead lines, the line corridor and the tower position often conflict with urban planning. In order to meet the needs of urban rapid development and reduce the occupied area, two single-circuit overhead lines are usually combined into a double-circuit overhead line on the same tower, and then changed into a cable laying mode to achieve the purpose of reducing the line corridor.

[0004] The inventor found that when the overhead downlead is changed into a cable mode, the double-circuit layered cable terminal steel pipe pole often has the possibility of "permanent and temporary combination", that is, the current lower circuit downlead is changed into a cable operation, the lower circuit is operated in the long-term, and the upper circuit is operated using the built cable line. After the cable terminal head is connected with the cable, it cannot be replaced and reused. When the near-term and long-term switching is performed, the existing steel pipe pole cannot adapt to the phase sequence switching. SUMMARY

[0005] In order to solve the problems of the prior art, the present application provides a phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole. Considering that the phase sequences of the upper and lower double-circuit overhead lines are different, a cross arm is added at a proper position on the pole body, and the phase sequence is adjusted by the downlead. The problem that the cable terminal head cannot be replaced and reused after being connected with the cable is solved, and the investment is saved.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole, comprising:

[0008] Two single-circuit overhead lines are erected in parallel, and the conductors are arranged horizontally. The first circuit is an upper circuit, and the second circuit is a lower circuit. The phase sequence of the first circuit is different from that of the second circuit.

[0009] When the first circuit operates in an overhead mode and the second circuit operates in a cable mode, the second circuit is led down to the cable terminal head of the cable terminal steel pipe pole through the cross arm on the cable terminal steel pipe pole. The phase sequence of the cable terminal head on the cable terminal steel pipe pole is the same as that of the second circuit.

[0010] When the second circuit is operated in the cable mode and the first circuit is operated in the cable mode, the first circuit is led down through the cross arm of the cable terminal steel pipe pole to the cable terminal head of the cable terminal steel pipe pole, and the phase sequence of the cable terminal head of the cable terminal steel pipe pole corresponds to the phase sequence of the cable terminal head of the tower corresponding to the other end of the cable.

[0011] As an optional implementation, when the phase sequence of the first circuit from left to right is A phase, B phase and C phase, the phase sequence of the second circuit from left to right is C phase, A phase and B phase, and the first circuit is operated in the overhead mode and the second circuit is operated in the cable mode, the phase sequence of the cable terminal head of the cable terminal steel pipe pole from left to right is C phase, A phase and B phase, and the phase sequence of the cable terminal head of the tower corresponding to the other end of the cable from left to right is C phase, B phase and A phase.

[0012] As an optional implementation, when the phase sequence of the first circuit from left to right is A phase, B phase and C phase, the phase sequence of the second circuit from left to right is C phase, A phase and B phase, and the first circuit is operated in the overhead mode and the second circuit is operated in the cable mode, the phase sequence of the cable terminal head of the cable terminal steel pipe pole from left to right is C phase, A phase and B phase, and the phase sequence of the cable terminal head of the tower corresponding to the other end of the cable from left to right is C phase, B phase and A phase.

[0013] Further, the C-phase line of the second circuit is directly led down along the cross arm and connected with the C-phase of the cable terminal head, the B-phase line of the second circuit is directly led down along the cross arm and connected with the B-phase of the cable terminal head, and the A-phase line of the second circuit is directly led down along the cross arm and connected with the A-phase of the cable terminal head.

[0014] Further, the first circuit is led down through the first cross arm and the second cross arm of the cable terminal steel pipe pole in sequence from top to bottom to the cable terminal head of the cable terminal steel pipe pole.

[0015] As an optional implementation, when the phase sequence of the first circuit from left to right is A phase, B phase and C phase, the phase sequence of the second circuit from left to right is C phase, A phase and B phase, and the first circuit is operated in the overhead mode and the second circuit is operated in the cable mode, the phase sequence of the cable terminal head of the cable terminal steel pipe pole from left to right is C phase, A phase and B phase, and the phase sequence of the cable terminal head of the tower corresponding to the other end of the cable from left to right is C phase, B phase and A phase.

[0016] As an optional implementation, when the phase sequence of the first circuit from left to right is A phase, B phase and C phase, the phase sequence of the second circuit from left to right is C phase, A phase and B phase, and the first circuit is operated in the overhead mode and the second circuit is operated in the cable mode, the phase sequence of the cable terminal head of the cable terminal steel pipe pole from left to right is C phase, A phase and B phase, and the phase sequence of the cable terminal head of the tower corresponding to the other end of the cable from left to right is C phase, B phase and A phase.

[0017] Further, the B-phase leading-down wire on the middle side is turned from the back side to the right side after passing through the seventh cross arm, the fifth cross arm, the eighth cross arm and the tenth cross arm in sequence, and is connected with the B-phase cable terminal head, and the tenth cross arm and the eighth cross arm form a 45° angle.

[0018] Further, the C-phase leading-down wire on the right side is turned from the right side to the middle side after passing through the jumper string with a support frame, the third cross arm, the fourth cross arm, the second cross arm and the old cross arm, and is connected with the C-phase cable terminal head.

[0019] Further, the A-phase leading-down wire on the left side is connected to the sixth cross arm through the jumper string, and is connected with the A-phase cable terminal head after passing through the ninth cross arm and the old cross arm in sequence.

[0020] As an optional implementation, the down lead conductor of the first loop and the down lead conductor of the second loop are provided with a conductor spacer.

[0021] As an optional implementation, the phase sequence of the cable terminal head of the tower corresponding to the other end of the cable is connected to the phase sequence of the substation.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. The phase sequence adjustment method based on the double-loop layered cable terminal steel pipe pole, considering the different phase sequences of the upper and lower double-loop overhead lines, adjusts the phase sequence by increasing a cross arm at a proper position on the pole, solves the problem that the cable terminal head cannot be replaced and reused after being connected with the cable, and saves investment.

[0024] 2. The phase sequence adjustment method based on the double-loop layered cable terminal steel pipe pole, the phase sequence of the cable terminal head of the tower corresponding to the other end of the cable is connected to the phase sequence of the substation, and the adaptability of the phase sequence of the cable terminal head of the cable terminal steel pipe pole is realized by the design of the cross arm of the cable terminal steel pipe pole.

[0025] The advantages of the additional aspects of the present application will be partially given in the following description, partially become obvious from the following description, or be known by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation of the present application.

[0027] Figure 1 The structure schematic diagram of the near-term double-loop layered cable terminal steel pipe pole is provided for the embodiment of the present application.

[0028] Figure 2 The down lead connection schematic diagram of the near-term double-loop layered cable terminal steel pipe pole is provided for the embodiment of the present application.

[0029] Figure 3 The overall connection schematic diagram of the near-term double-loop layered cable terminal steel pipe pole is provided for the embodiment of the present application.

[0030] Figure 4 The structure schematic diagram of the long-term double-loop layered cable terminal steel pipe pole is provided for the embodiment of the present application.

[0031] Figure 5 The down lead connection schematic diagram of the long-term double-loop layered cable terminal steel pipe pole is provided for the embodiment of the present application.

[0032] Figure 6The long-term double-circuit layered cable terminal steel pipe pole overall connection schematic diagram provided by the embodiment of the present application.

[0033] 1-220KV cable; 2-cable terminal head; 3-zinc oxide arrester; 4-hydraulic type double-conductor T-shaped clamp; 5-composite cross arm insulator; 6-current lead conductor; 7-conductor spacer; 8-cable protection pipe; 9-first cross arm; 10-second cross arm; 11-phase A; 12-phase C; 13-third cross arm; 14-fourth cross arm; 15-fifth cross arm; 16-sixth cross arm; 17-seventh cross arm; 18-eighth cross arm; 19-ninth cross arm; 20-tenth cross arm; 21-phase B. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with the drawings and embodiments.

[0035] It should be noted that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0036] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, operation, device, component, and / or combination thereof.

[0037] In the present application, the terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the convenience of describing the structural relationship of the components or elements of the present application, and cannot be understood as a limitation on the present application.

[0038] In the present application, the terms such as "fixedly connected", "connected", "connected" should be understood broadly, which means that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For related researchers or technicians in the art, the specific meaning of the above terms in the present application can be determined according to the specific circumstances, and cannot be understood as a limitation on the present application.

[0039] In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0040] Embodiment:

[0041] The embodiment provides a phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole.

[0042] The two single-circuit overhead lines are arranged in parallel, and the wires are arranged horizontally. The first circuit is an upper circuit (i.e., circuit 1), and the second circuit is a lower circuit (i.e., circuit 2). The phase sequence of the first circuit is different from that of the second circuit.

[0043] When the first circuit is operated in an overhead mode and the second circuit is operated in a cable mode, the second circuit is led down to a cable terminal head 2 of the cable terminal steel pipe pole through a cross arm on the cable terminal steel pipe pole. The phase sequence of the cable terminal head 2 on the cable terminal steel pipe pole is the same as that of the second circuit.

[0044] When the second circuit is operated in a cable mode and the first circuit is operated in a cable mode, the first circuit is led down to a cable terminal head of the cable terminal steel pipe pole through a cross arm on the cable terminal steel pipe pole. The phase sequence of the cable terminal head on the cable terminal steel pipe pole corresponds to the phase sequence of a cable terminal head of a tower corresponding to the other end of the cable.

[0045] Specifically, the method comprises the following steps.

[0046] In the near future, as shown in FIGS. 1, 2 and 3, the phase sequence of the first circuit from left to right is A phase, B phase and C phase, the phase sequence of the second circuit from left to right is C phase 12, A phase 11 and B phase 21, the first circuit is operated in an overhead mode, and the second circuit is operated in a cable mode. Figure 1 Figure 2 Figure 3

[0047] The phase sequence of the cable terminal head on the cable terminal steel pipe pole from left to right is C phase, A phase and B phase, and the phase sequence of the cable terminal head of the tower corresponding to the other end of the 220KV cable 1 from left to right is C phase, B phase and A phase.

[0048] The C phase line of the second circuit is directly led down along the cross arm and connected with the C phase of the cable terminal head, the B phase line of the second circuit is directly led down along the cross arm and connected with the B phase of the cable terminal head, and the A phase line of the second circuit is directly led down along the cross arm and connected with the A phase of the cable terminal head.

[0049] The first circuit is sequentially led down to the cable terminal head of the cable terminal steel pipe pole through the first cross arm 9 and the second cross arm 10 on the cable terminal steel pipe pole from top to bottom.

[0050] ​​​At this time, one end of the cable is connected with the cable terminal steel pipe pole, and the other end of the cable is connected with the B1 tower, and it can be seen that the phase sequence of the cable terminal head of the BI tower is C phase, B phase and A phase from left to right, and at this time, the phase sequence of the cable terminal head on the cable terminal steel pipe is C phase, A phase and B phase from left to right, and the cable terminal head cannot be replaced after being connected with the cable, and meanwhile, in order to ensure that the phase-to-phase distance meets the specification requirements, the corresponding relationship has been determined.

[0051] In the future, as shown in Figure 4 , Figure 5 and Figure 6 , the phase sequence of the first circuit from left to right is A phase, B phase and C phase, the phase sequence of the second circuit from left to right is C phase, A phase and B phase, and when the second circuit is transported back from the cable mode and the first circuit is changed to operate in the cable mode;

[0052] The phase sequence of the cable terminal head of the tower corresponding to the other end of the cable is A phase, B phase and C phase from left to right, and at this time, the phase sequence of the cable terminal head on the cable terminal steel pipe pole is A phase, C phase and B phase from left to right.

[0053] The B-phase downlead in the middle side passes through the seventh cross arm 17, the fifth cross arm 15, the eighth cross arm 18 and the tenth cross arm 20 in turn, and then turns from the back side to the right side, and is connected with the B-phase cable terminal head, and the tenth cross arm 20 and the eighth cross arm 18 form a 45° angle.

[0054] The C-phase downlead on the right side passes through the jumper string with a support frame, the third cross arm 13, the fourth cross arm 14, the second cross arm 10 and the old cross arm, and then turns from the right side to the middle side and continues to be led down to be connected with the C-phase cable terminal head.

[0055] The A-phase downlead on the left side passes through the jumper string to the sixth cross arm 16, and then continues to be led down, passes through the ninth cross arm 19 and the old cross arm in turn, and is connected with the A-phase cable terminal head.

[0056] In the embodiment, the downlead 6 of the first circuit and the second circuit is provided with a lead spacing rod 7, and the double-circuit layered cable terminal steel pipe pole is also correspondingly provided with a zinc oxide lightning arrester 3, a hydraulic double-lead T-shaped clamp 4, a composite cross arm insulator 5 and a cable protection pipe 8.

[0057] In the embodiment, the phase sequence of the cable terminal head of the tower corresponding to the other end of the cable is related to the phase sequence of the substation connected by the cable terminal head, the phase sequence of the double-circuit layered cable terminal steel pipe pole should be consistent with the phase sequence of the adjacent connected substation, and with the change of the connected system, the phase sequence of the double-circuit layered cable terminal steel pipe pole will change with the change of the connected substation.

[0058] According to the method of the embodiment, the reserved cross arm position can be appropriately adjusted to solve the downlead problem of any phase sequence combination.

[0059] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole, characterized in that: Two single-circuit overhead lines are erected in parallel with the conductors arranged horizontally. The first circuit is the upper circuit and the second circuit is the lower circuit. The phase sequence of the first circuit is different from that of the second circuit. When the first circuit operates in an overhead manner and the second circuit is switched to a cable manner, the second circuit is led down to the cable terminal head on the cable terminal steel pipe pole through the crossarm on the cable terminal steel pipe pole. The phase sequence of the cable terminal head on the cable terminal steel pipe pole is the same as the phase sequence of the second circuit. When the second circuit is decommissioned from the cable mode and the first circuit is switched to the cable mode, the first circuit is led down to the cable terminal head on the cable terminal steel pipe pole through the crossarm on the cable terminal steel pipe pole. The phase sequence of the cable terminal head on the cable terminal steel pipe pole corresponds to the phase sequence of the cable terminal head on the corresponding tower at the other end of the cable. When the phase sequence of the first circuit from left to right is phase A, phase B and phase C, and the phase sequence of the second circuit from left to right is phase C, phase A and phase B, and the second circuit is decommissioned from cable mode, while the first circuit is switched to cable mode for operation; The phase sequence of the cable terminal head on the tower corresponding to the other end of the cable is A, B and C from left to right. At the same time, the phase sequence of the cable terminal head on the steel pipe pole at the cable terminal is A, C and B from left to right. The B-phase down conductor on the middle side passes through the seventh, fifth, eighth, and tenth crossarms in sequence before turning to the right side and connecting with the B-phase cable terminal head. The tenth crossarm and the eighth crossarm form a 45° angle.

2. The phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole as described in claim 1, characterized in that: When the phase sequence of the first circuit from left to right is phase A, phase B, and phase C, and the phase sequence of the second circuit from left to right is phase C, phase A, and phase B, and the first circuit is operated in an overhead manner while the second circuit is operated in a cable manner, the phase sequence of the cable terminal head on the steel pipe pole at the cable terminal is phase C, phase A, and phase B from left to right, and the phase sequence of the cable terminal head on the corresponding tower at the other end of the cable is phase C, phase B, and phase A from left to right.

3. The phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole as described in claim 2, characterized in that: The C-phase line of the second circuit is directly led down along the crossarm and connected to the C-phase of the cable terminal. The B-phase line of the second circuit is directly led down along the crossarm and connected to the B-phase of the cable terminal. The A-phase line of the second circuit is directly led down along the crossarm and connected to the A-phase of the cable terminal.

4. The phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole as described in any one of claims 1-3, characterized in that: The first circuit is led down from top to bottom through the first and second crossarms on the cable terminal steel pipe pole to the cable terminal head on the cable terminal steel pipe pole.

5. The phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole as described in claim 1, characterized in that: The C-phase down conductor on the right side passes through the jumper string with support frame, the third crossarm, the fourth crossarm, the second crossarm, and the reused crossarm, then turns from the right side to the middle side and continues to be led down to connect with the C-phase cable terminal head.

6. The phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole as described in claim 1, characterized in that: The left-side A-phase down conductor is connected in series with a jumper to the sixth crossarm and then continues down, passing through the ninth crossarm and the reused crossarm in sequence before connecting to the A-phase cable terminal.

7. The phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole as described in claim 1, characterized in that: The first and second circuits are equipped with conductor spacers on their lower guide wires.

8. The phase sequence adjustment method based on a double-circuit layered cable terminal steel pipe pole as described in claim 1, characterized in that: The phase sequence of the cable terminal head of the tower corresponding to the other end of the cable is related to the phase sequence of the substation to which it is connected.

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