A DC ice melting line short-circuiting device

Abstract

The present invention discloses a DC ice melting line short-circuiting device, which includes an A-phase branch busbar, a B-phase branch busbar, and a C-phase branch busbar. A three-way joint II is provided on the A-phase branch busbar, a three-way joint III is provided on the B-phase branch busbar, and a three-way joint IV is provided on the C-phase branch busbar. The three-way joint II is electrically connected to the disconnecting switch I, the three-way joint IV is electrically connected to the disconnecting switch II, and the disconnecting switch I, the disconnecting switch II, and the three-way joint III are all electrically connected to the three-way joint I. The beneficial effects of the present invention are as follows: It can solve the problem that it is impossible to install an ice melting device due to limited space in the current substation or power plant using SF<subgt;6< / subgt> gas-insulated metal-enclosed switchgear. It can realize the full-automatic operation of three-phase short-circuiting of the ice melting line, shorten the line outage time during ice melting, and has the advantages of not occupying additional land, short construction time, and good implementation feasibility.

Description

Technical Field

[0001] The present invention relates to the DC de-icing technology for power grid transmission lines, and aims to provide a DC de-icing line short-circuiting device which is used for SF6 gas-insulated metal-enclosed switchgear (GIS equipment) and can be simply and conveniently realized. Background Art

[0002] With the change of global climate conditions, low-temperature rain, snow and ice weather occurs frequently, and ice disasters have become one of the important reasons affecting the safe operation of transmission lines. From the actual operation situation, the outdoor open-type DC de-icing devices installed in China have played a significant role in actual application and provided a reliable guarantee for the safe operation of transmission lines.

[0003] With the rapid development of China's economy and society, during the project implementation process, there are higher and higher requirements for improving land utilization rate and saving land. In recent years, in order to save land occupation, more and more projects of substations and step-up stations of power plants adopt GIS equipment, and there is not enough space on the outgoing line side for the installation of de-icing devices.

[0004] From the current application of DC de-icing devices in the power grid, for those with space for installing de-icing devices, outdoor open-type special disconnectors are added, and the down-lead wires are hung on the line and connected to the de-icing device. When de-icing is required, the switch is closed to realize the short-circuiting of phase A, phase B and phase C of the de-icing line. For those without space for installing de-icing devices, the method of manually temporarily connecting short-circuit wires is adopted to realize line de-icing. Due to the high hanging points of the line, during manual operation, it takes a long time, the operation intensity and implementation difficulty are large, and the time required to complete line de-icing is long, and the de-icing efficiency is seriously affected.

[0005] Adopting the method of manually temporarily connecting short-circuit wires on-site has the disadvantages of long line outage time, high danger and poor reliability. Therefore, for those adopting GIS equipment and without conditions for installing de-icing devices, the problems of connection and isolation between the de-icing line and the DC de-icing device must be better solved, the connection and isolation time should be shortened, and the line outage time should be reduced. Summary of the Invention

[0006] The purpose of the present invention is to provide a DC de-icing line short-circuiting device in view of the problems and deficiencies existing in the prior art, and solve the problem of difficult installation of existing DC de-icing. The facilities and equipment required for this device are: a special GIS disconnector for DC de-icing line short-circuiting, a GIS outgoing line branch busbar, a T-shaped tee joint and a connecting flange.

[0007] The purpose of the present invention is achieved by the following technical solutions:

[0008] A DC ice melting line short - circuiting device includes an A - phase branch busbar, a B - phase branch busbar, and a C - phase branch busbar. There is a three - way joint Ⅱ on the A - phase branch busbar, a three - way joint Ⅲ on the B - phase branch busbar, and a three - way joint Ⅳ on the C - phase branch busbar. The three - way joint Ⅱ is electrically connected to the disconnecting switch Ⅰ, the three - way joint Ⅳ is electrically connected to the disconnecting switch Ⅱ, and the disconnecting switch Ⅰ, the disconnecting switch Ⅱ, and the three - way joint Ⅲ are all electrically connected to the three - way joint Ⅰ.

[0009] Further, the moving contact side of the disconnecting switch Ⅰ is electrically connected to the three - way joint Ⅱ, the moving contact side of the disconnecting switch Ⅱ is electrically connected to the three - way joint Ⅳ, and the static contact sides of the disconnecting switch Ⅰ and the disconnecting switch Ⅱ are both electrically connected to the three - way joint Ⅰ.

[0010] Further, there is an operating mechanism Ⅰ on the disconnecting switch Ⅰ and an operating mechanism Ⅱ on the disconnecting switch Ⅱ.

[0011] Further, both the operating mechanism Ⅰ and the operating mechanism Ⅱ are electric type.

[0012] Further, the electrical connection is made using an insulated busbar.

[0013] Further, both ends of the insulated busbar are provided with connecting flanges.

[0014] Further, the disconnecting switch Ⅰ, the disconnecting switch Ⅱ, and the three - way joint Ⅰ are all arranged on a support frame.

[0015] Further, the A - phase branch busbar, the B - phase branch busbar, and the C - phase branch busbar are all connected between the GIS outgoing line disconnecting switch and the GIS outgoing line bushing.

[0016] Add a T - shaped three - way joint between the GIS outgoing line disconnecting switch and the outgoing line bushing, and connect the DC ice melting line short - circuiting device. When ice melting is required for the ice melting line, short - circuit the A - phase, B - phase, and C - phase of the ice melting line, and use the DC ice melting line short - circuiting device to achieve the automatic short - circuit of the A - phase, B - phase, and C - phase of the ice melting line.

[0017] The technical key points of the present invention are: including three T - shaped three - way joint structures on the GIS outgoing line branch busbar, a DC ice melting line short - circuiting device arranged in an "E" - shaped layout, with a single - phase disconnecting switch enclosed by SF6 gas insulation on each of the left and right sides of the device; in the middle is a T - shaped three - way joint, which is connected to the disconnecting switches on both sides and the T - shaped three - way joint of the GIS outgoing line B - phase branch busbar through an SF6 gas - insulated busbar. There are two moving contacts and two static contacts for the disconnecting switch in the device, and the moving and static contacts are electrically connected to the outgoing line branch busbar through an insulated busbar.

[0018] Advantages of the present invention: It can solve the problem that the ice melting device cannot be installed due to limited space in the current substation or power plant using SF6 gas-insulated metal-enclosed switchgear. It can realize the fully automated operation of three-phase short-circuit of the ice melting line, shorten the line outage time during ice melting, and has the advantages of not occupying additional land, short construction time, and good implementation feasibility.

[0019] The main solution of the present invention and its various further alternative solutions can be freely combined to form multiple solutions, all of which are the solutions that can be adopted and claimed by the present invention; and in the present invention, (each non-conflicting alternative) alternatives can be freely combined with each other and with other alternatives. Those skilled in the art can understand that there are various combinations according to the prior art and common general knowledge after understanding the solution of the present invention, all of which are the technical solutions to be protected by the present invention and will not be enumerated here. Brief Description of the Drawings

[0020] Figure 1 It is a schematic plan layout diagram of the present invention.

[0021] Figure 2 It is a schematic front sectional view of the present invention.

[0022] Figure 3 It is a schematic right sectional view of the present invention.

[0023] In the figure: 1 - Isolator I, 2 - Isolator II, 3 - Operating mechanism I, 4 - Operating mechanism II, 5 - Tee I, 6 - Tee II, 7 - Tee III, 8 - Tee IV, 9 - Insulated busbar, 10 - Support frame, 11 - Connecting flange; 101 - Phase A branch busbar, 102 - Phase B branch busbar, 103 - Phase C branch busbar, 104 - GIS outgoing line isolator, 105 - GIS outgoing line bushing. Detailed Embodiments

[0024] The present invention will be further described below in conjunction with specific embodiments and the drawings.

[0025] Refer to Figures 1 to 3 As shown, a DC ice melting line short-circuiting device includes a GIS outgoing line isolator 104, a GIS outgoing line branch busbar, a GIS outgoing line bushing 105, an isolator I 1, an isolator II 2, an operating mechanism I 3, an operating mechanism II 4, a tee I 5, a tee II 6, a tee III 7, a tee IV 8, an insulated busbar 9, a support frame 10, and a connecting flange 11. The GIS outgoing line branch busbar includes a Phase A branch busbar 101, a Phase B branch busbar 102, and a Phase C branch busbar 103.

[0026] Between the GIS outgoing line disconnector 104 and the GIS outgoing line bushing 105, there are connected with the phase A branch bus 101, the phase B branch bus 102, and the phase C branch bus 103 respectively. There is a tee joint II 6 on the phase A branch bus 101, a tee joint III 7 on the phase B branch bus 102, and a tee joint IV 8 on the phase C branch bus 103.

[0027] The tee joint II 6 is electrically connected to the disconnector I 1 through the insulating bus 9, the tee joint IV 8 is electrically connected to the disconnector II 2 through the insulating bus 9, and the disconnector I 1, the disconnector II 2, and the tee joint III 7 are all electrically connected to the tee joint I 5 through the insulating bus 9. The disconnector I 1, the disconnector II 2, and the tee joint I 5 are arranged in an "E" shape.

[0028] The moving contact side of the disconnector I 1 is electrically connected to the tee joint II 6, the moving contact side of the disconnector II 2 is electrically connected to the tee joint IV 8, and the static contact sides of the disconnector I 1 and the disconnector II 2 are both electrically connected to the tee joint I 5.

[0029] There is an operating mechanism I 3 on the disconnector I 1, and an operating mechanism II 4 on the disconnector II 2. Both the operating mechanism I 3 and the operating mechanism II 4 are electric type. In order to drive the opening and closing of the main disconnectors of the disconnector I 1 and the disconnector II 2, outside the metal enclosed structure of the disconnector, there are also provided the operating mechanism I 3 and the operating mechanism II 4. By rotating the input shaft of the operating mechanism, the moving contact is driven to move, realizing the opening and closing.

[0030] To ensure safety, the insulation level of the DC ice melting line short - circuit device needs to meet certain requirements. It should be based on the ice melting line voltage level (110 kV, 220 kV, 330 kV, 500 kV, 750 kV or 1000 kV) and the over - voltage level.

[0031] In the DC ice melting line short - circuit device of this device, the disconnector and its electric operating mechanism used are common driving devices in the field. The main disconnector electric operating mechanism is driven by a 220V or 380V AC power supply. By operating the control switch or inputting an operation instruction in the control room, the main disconnector electric operating mechanism drives the main disconnector to move, thus realizing the opening and closing of the main disconnector, and further controlling the closing or opening of the disconnector.

[0032] Both ends of the insulating bus 9 are provided with connecting flanges 11, and the connecting flanges 11 are used to realize the connection between the insulating bus 9 and the disconnector or the tee joint. The disconnector I 1, the disconnector II 2, and the tee joint I 5 are all located below the GIS outgoing line branch bus, so the disconnector I 1, the disconnector II 2, and the tee joint I 5 are supported and fixed by the support frame 10.

[0033] Using the DC ice melting short - circuit device for ice melting includes the following steps:

[0034] Step 1: Install a set of DC de-icing devices in the substation on the opposite side of the de-icing line of the GIS step-up substation or substation to provide de-icing power for the de-icing line.

[0035] Step 2: Add a T-shaped tee between the GIS outgoing line disconnect switch and the outgoing line bushing in the step-up substation or substation, and connect the DC de-icing line short-circuiting device below or on the side of the bus. The moving contact side of the disconnect switch of the DC de-icing line short-circuiting device is connected to the A-phase and C-phase branch buses of the GIS outgoing line, and the static contact side is connected to the B-phase branch bus of the GIS outgoing line through the T-shaped tee.

[0036] Step 3: Disconnect the de-icing line from the power grid by operating the circuit breakers and disconnect switches in the step-up substation or substation, and put the de-icing line to be de-iced into the outage state.

[0037] Step 4: Close the switch of the de-icing device in the substation on the opposite side to connect the DC de-icing device to the de-icing line.

[0038] Step 5: Keep the disconnect switch of the DC de-icing line short-circuiting device in the closed state to achieve the three-phase short-circuit state of the A-phase, B-phase, and C-phase of the de-icing line. At this point, the de-icing line is in the de-icing state, and starting the DC de-icing device can de-ice the line.

[0039] Step 6: After de-icing is completed, put the disconnect switch of the DC de-icing line short-circuiting device in the open state, disconnect the DC de-icing device in the substation on the opposite side from the de-icing line, restore the de-icing line to the outage state, and then the line operation can be restored.

[0040] The basic examples of the present invention and their respective further selected examples can be freely combined to form multiple embodiments, all of which are the embodiments that can be adopted and claimed by the present invention. In the solution of the present invention, each selected example can be arbitrarily combined with any basic example and selected example.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A DC ice melting line short - circuit device, comprising an A - phase branch busbar (101), a B - phase branch busbar (102), and a C - phase branch busbar (103), characterized in that: A-phase branch busbar (101) is provided with a three-way joint II (6), B-phase branch busbar (102) is provided with a three-way joint III (7), and C-phase branch busbar (103) is provided with a three-way joint IV (8). The three-way joint II (6) is electrically connected to the disconnecting switch I (1), the three-way joint IV (8) is electrically connected to the disconnecting switch II (2), and the disconnecting switch I (1), the disconnecting switch II (2), and the three-way joint III (7) are all electrically connected to the three-way joint I (5); The moving contact side of the disconnecting switch I (1) is electrically connected to the three-way joint II (6), the moving contact side of the disconnecting switch II (2) is electrically connected to the three-way joint IV (8), and the static contact sides of the disconnecting switch I (1) and the disconnecting switch II (2) are both electrically connected to the three-way joint I (5); The disconnecting switch I (1) is provided with an operating mechanism I (3), and the disconnecting switch II (2) is provided with an operating mechanism II (4); The A-phase branch busbar (101), B-phase branch busbar (102), and C-phase branch busbar (103) are all connected between the GIS outgoing disconnecting switch (104) and the GIS outgoing bushing (105).

2. The DC ice-melting line short-circuiting device according to claim 1, wherein: Both the operating mechanism I (3) and the operating mechanism II (4) are electric type.

3. The direct current ice melting line short-circuiting device according to claim 1, wherein: The electrical connection is made by using an insulated busbar (9).

4. The DC ice melting line short-circuiting device according to claim 3, characterized in that: Both ends of the insulated busbar (9) are provided with connecting flanges (11).

5. The direct current ice melting line short-circuiting device according to claim 1, characterized in that: The disconnecting switch I (1), the disconnecting switch II (2), and the three-way joint I (5) are all arranged on the support frame (10).

Images