CN103065861B - Outdoor AC high-voltage SF6 automatic sectionalizer - Google Patents

Abstract

<b>Outdoor AC high voltage</b><b>SF6</b><b>Automatic sectionalizer is related to the improvement of sectionalizer structure. The invention provides an outdoor AC high-voltage</b><b>SF6</b><b> automatic sectionalizer with good sealing performance and timely opening and closing. The invention comprises a box body, which is filled with </b><b>SF6</b><b> gas, a rotating shaft is arranged in the middle of the box body, and a moving contact is arranged on the rotating shaft; an insulator is arranged on the box body, and the insulator One end extends into the box and is provided with a static contact corresponding to the moving contact. The other end of the insulator is provided with a terminal. The terminal and the static contact are connected through a conductive rod. The main points of the structure are that one end of the shaft is sealed with the box by a magnetic fluid. The spring mechanism that drives the rotating shaft on the outside is connected. The energy storage handle and the opening and closing electric tripper of the driving spring mechanism are arranged on the outside of the spring mechanism. The controlled port of the opening and closing electric tripper is connected with the output control port of the electronic controller. connected; the electronic controller detects the current in the superior line to control the action of the opening and closing electric release. </b>

Description

Outdoor AC high voltage SF6 automatic sectionalizer

technical field

The present invention relates to the improvement of the segmenter structure.

Background technique

The sectionalizer is a switching device that cooperates with the front-end switch on the power supply side and automatically opens when there is no voltage or no current. When a permanent fault occurs, the sectionalizer will be locked in the opening state after a predetermined number of opening and closing operations, so as to achieve the purpose of isolating the faulty line section.

The SF6 gas in the box of the existing sectionalizer may leak, so the sealing performance of the box needs to be improved.

Secondly, the opening and closing control of the existing sectionalizer is not timely enough, which affects the use effect.

In addition, the electromagnetic tripping of the existing outdoor pole-mounted switch generally requires an external voltage transformer (PT) to provide energy for it. Due to the failure of the PT, the switch often fails to work normally; and the external PT also increases the project cost.

Contents of the invention

The present invention aims at the above problems and provides an outdoor AC high-voltage SF6 automatic sectionalizer with good sealing performance and timely opening and closing.

In order to achieve the above object, the present invention adopts the following technical scheme, the present invention comprises a box body, the box body is filled with SF6 gas, a rotating shaft is arranged in the middle of the box body, and a moving contact is arranged on the rotating shaft; into the box and is provided with a static contact corresponding to the moving contact, and the other end of the insulator is provided with a terminal, which is connected to the static contact through a conductive rod. The spring mechanism that drives the rotation shaft is connected, and the energy storage handle and the opening and closing electric release are arranged on the outside of the spring mechanism, and the controlled port of the opening and closing electric release is connected with the output control port of the electronic controller; The electronic controller detects the magnitude of the current in the superior line to control the action of the opening and closing electric release.

As a preferred solution, a current transformer surrounds the conductive rod in the present invention, and the output end of the current transformer is connected to the power input port of the electronic controller.

As another preferred solution, a pressure gauge for detecting the pressure of SF6 gas in the box is provided outside the box in the present invention.

As another preferred solution, a manual release hook of the spring mechanism is provided outside the spring mechanism of the present invention.

As another preferred solution, the insulator of the present invention is a silicone rubber composite insulator.

Secondly, the box body of the present invention is welded by stainless steel plates above 3mm.

In addition, the opening and closing electric release of the present invention adopts a permanent magnet mechanism.

The invention has beneficial effects.

In the present invention, one end of the rotating shaft is connected with the spring mechanism driving the rotating shaft outside the casing through the magnetic fluid seal shaft head. The magnetic fluid seal shaft head is suitable for a wide temperature range and has good performance in pressure difference resistance, which can reliably ensure that the SF6 gas in the box does not leak.

The controlled port of the opening and closing electric release of the present invention is connected with the output control port of the electronic controller; the electronic controller detects the magnitude of the current in the upper line to control the opening and closing electric release. The opening and closing of the present invention can be controlled in time through the electronic controller, and the user can adjust the rated starting current and counting times of the electronic controller on site according to actual needs, and can connect the electronic controller with the fault remote transmitter to realize remote control of the sectionalizer state monitor.

Description of drawings

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

Fig. 1 is the front view of the present invention.

Fig. 2 is a top view of the present invention.

Fig. 3 is a schematic diagram showing the cooperation of the present invention with a sectionalizer and a recloser or a circuit breaker.

In the figure, 1 is the moving contact, 2 is the rotating shaft, 3 is the box, 4 is the static contact, 5 is the conductive rod, 6 is the insulator, 7 is the terminal, 8 is the current transformer, and 9 is the manual release hook , 10 is the opening and closing electric release, 11 is the magnetic fluid seal shaft head, 12 is the spring mechanism, and 13 is the energy storage handle.

detailed description

As shown in Figure 1, the present invention includes a box body 3 filled with SF6 gas, a rotating shaft 2 is arranged in the middle of the box body 3, and a moving contact 1 is arranged on the rotating shaft 2; an insulator 6 is arranged on the box body 3, One end of the insulator 6 extends into the box body 3 and is provided with a static contact 4 corresponding to the moving contact 1. The other end of the insulator 6 is provided with a terminal 7. The terminal 7 is connected to the static contact 4 through the conductive rod 5. One end of the rotating shaft 2 The magnetic fluid seal shaft head 11 is connected to the spring mechanism 12 that drives the rotating shaft 2 outside the box body 3 to rotate. The outside of the spring mechanism 12 is provided with an energy storage handle 13 that drives the spring mechanism 12 and an electric release 10 for opening and closing. The controlled port of the brake electric release 10 is connected to the output control port of the electronic controller; the electronic controller detects the magnitude of the current in the upper line to control the opening and closing electric release 10 to act.

The rotating shaft of the spring mechanism 12 can be combined with stainless steel and copper sleeve, which improves the corrosion resistance of the spring mechanism 12 and ensures the reliability of the work.

The conductive rod 5 is surrounded by a current transformer 8, and the output end of the current transformer 8 is connected with the power input port of the electronic controller. Only the energy provided by its own current transformer 8 can meet the power demand of the electronic controller.

The outside of the box 3 is provided with a pressure gauge for detecting the pressure of SF6 gas in the box 3 .

The manual release hook 9 of the spring mechanism 12 is arranged outside the spring mechanism 12 .

The insulator 6 is a silicone rubber composite insulator; it has good sealing performance and strong insulation performance.

The box body 3 is welded by stainless steel plates of more than 3mm. The surface of the box body 3 can be treated with plastic spraying, which has high strength, corrosion resistance and strong sealing performance, and can work stably for a long time.

The opening and closing electric release 10 adopts a permanent magnet mechanism. The permanent magnet mechanism has small action energy, and cooperates with the current transformer 8 to provide a stable and reliable action mechanism for the present invention.

The present invention can be installed on a single pole or double poles according to user needs. For single-pole installation, the user can prepare a standard circuit breaker bracket by himself, and for double-pole installation brackets, standard cross-arm and channel steel can be selected. The installation method is basically the same as that of the circuit breaker on the pole, which is convenient and quick.

As shown in Figure 3, a recloser is selected at the outlet of the substation, and the setting is "one fast and three slow". Branch line selects six F1, F2, F3, F4, F5, F6 of the present invention for use, and its circuit is divided into L1, L2, L3, L4, L5, L6, L7 section. The rated starting current value of the present invention matches the starting current value of the recloser, and the counting times of F1 are 3 times, the counting times of F2, F3 and F5 are 2 times, and the counting times of F4 and F6 are 1 time.

1. If the fault E1 occurs in the L5 section, the recloser, F1, F3, and F4 pass the fault current, the recloser automatically opens, the line loses voltage, and the F4 reaches the set 1 counting times to automatically open, and the fault L5 section is isolated, and the recloser After automatic reclosing, the power supply of line L1, L2, L3, L4, L6 and L7 will be restored.

2. If fault E2 occurs in section L6, the recloser, F1, and F5 pass through the fault current, and the recloser will automatically open. If it is an instantaneous fault, the recloser will automatically reclose to restore power supply. If F1 and F5 have not reached the set counting times, they should be in the closing state. If it is a permanent fault, the automatic reclosing of the recloser is unsuccessful, it opens again, the line loses voltage, F5 automatically opens when it reaches the set 2 counting times, isolates the fault section L6, and F1 is in the closing state if it does not reach the set counting number. After the recloser recloses, the power supply of the lines L1, L2, L3, L4 and L5 will be restored.

3. If fault E3 occurs in section L2, the recloser and F1 pass the fault current, and the recloser will automatically open. If it is an instantaneous fault, the recloser automatically recloses and restores the power supply successfully. If F1 has not reached the set counting times, it should be in the closing state. If it is a permanent fault, the recloser fails to reclose, open, the recloser fails to reclose again, opens again, the line loses voltage, F1 reaches the set count of 3 times and automatically opens, isolates the fault L2 section, and after the recloser recloses Restore the power supply of L1 section of the line.

Below in conjunction with accompanying drawing, the present invention uses action process.

The opening operation must first store energy through the spring mechanism 12. After the mechanism has stored energy, the logo arrow will indicate the energy storage state. When the closing handle is operated, the spring mechanism 12 will drive the rotating shaft 2 to rotate 65 degrees to make the switch in the closing position. After the sectionalizer is closed, the closing and opening arrows will point to the closed position.

When the line has a fault current greater than the rated starting current, the electronic controller starts to start. When the upper level switch is opened, the electronic controller in the sectionalizer starts counting. After the sectionalizer completes the specified number of counts, When the current in the line is less than 300mA, the controller gives an electric signal to the starting coil of the permanent magnet mechanism, driving the moving iron core of the permanent magnet mechanism to pop up, driving the mechanism to trip, the spring mechanism 12 opening spring releases, and the sectionalizer opens. (The total opening time is not more than 100mS), so as to realize the function of isolating the faulty section. When the switch of the upper level is reclosed again, the faulty section is isolated, and the non-faulty section is put into operation. After the staff eliminates the fault, the energy storage handle can be pulled down, the switch can be closed manually, and the line operation can be resumed.

When the upper level switch passes through reclosing, the instantaneous fault is eliminated, and the sectionalizer does not reach the specified counting times, and the line supplies power as usual. After 20S (reset time), the sectionalizer will return to the initial state.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Under the premise, some simple deduction or replacement can also be made, which should be regarded as belonging to the protection scope determined by the claims submitted in the present invention.

Claims (1)

1. outdoor AC high-voltage SF6 automatic sectionalizer, comprises casing (3), and casing is filled with SF6 gas in (3), and casing (3) middle part is provided with rotating shaft (2), is provided with moving contact (1) in rotating shaft (2), on casing (3), be provided with insulator (6), insulator (6) one end is stretched in casing (3) and is provided with static contact (4) corresponding to moving contact (1), insulator (6) other end is provided with binding post (7), binding post (7) is connected by conducting rod (5) with static contact (4), it is characterized in that the spring mechanism (12) that rotate with the drive shaft (2) in casing (3) outside by magnet fluid sealing spindle nose (11) rotating shaft (2) one end is connected, spring mechanism (12) arranged outside has energy accumulation handle (13) and the electronic electrical apparatus release of divide-shut brake (10) of driving spring mechanism (12), the controlled ports of the electronic electrical apparatus release of divide-shut brake (10) is connected with the output control terminal mouth of electronic controller, electronic controller detects the electronic electrical apparatus release of size of current control divide-shut brake (10) action in higher level's circuit,

Described conducting rod (5) is wound with current transformer (8) around, and the output of current transformer (8) is connected with electronic controller power input mouth;

Described casing (3) arranged outside has the Pressure gauge of the interior SF6 gas pressure of detection casing (3);

Described spring mechanism (12) arranged outside has the changable clasp (9) of spring mechanism (12);

Described insulator (6) is silicon rubber compound insulator;

Described casing (3) adopts the upper above corrosion resistant plate of 3mm to be welded;

The electronic electrical apparatus release of described divide-shut brake (10) adopts permanent magnet mechanism;

Described spring mechanism (12) shaft adopts stainless steel to add copper sheathing combination;

Plastic-blasting processing is taked on described casing (3) surface;

Automatic circuit is selected in electric substation outlet, adjusts as " one fast three slow "; Branched line is selected six described outdoor AC high-voltage SF6 automatic sectionalizer F1, F2, F3, F4, F5, F6, and its circuit is divided into L1, L2, L3, L4, L5, L6, L7 section; The specified starting current value of described outdoor AC high-voltage SF6 automatic sectionalizer matches with automatic circuit starting current value, F1 counts 3 times, F2, F3, F5 counts 2 times, F4, F6 counts 1 time;

1), if fault E1 occurs in L5 section, automatic circuit, F1, F3, F4 are by fault current, automatic circuit automatic brake separating, circuit decompression, F4 reaches the counts automatic brake separating of adjusting 1 time, and isolated fault L5 section is recovered circuit L1, L2, L3, L4, L6, the power supply of L7 section after automatic circuit automatic reclosing;

2), if fault E2 occurs in L6 section, automatic circuit, F1, F5 pass through fault current, automatic circuit automatic brake separating, and transient fault if, automatic circuit automatic reclosing successfully restores electricity; F1, F5 do not reach the counts of adjusting should be in "on" position; Permanent fault if, automatic circuit automatic reclosing is unsuccessful, separating brake again, circuit decompression, F5 reaches the counts automatic brake separating of adjusting 2 times, isolated fault L6 section, F1 does not reach the counts of adjusting in "on" position; After overlapping, recovers automatic circuit circuit L1, L2, L3, L4, the power supply of L5 section;

3), if fault E3 occurs in L2 section, automatic circuit, F1 are by fault current, automatic circuit automatic brake separating; Transient fault if, automatic circuit automatic reclosing successfully restores electricity; F1 does not reach the counts of adjusting should be in "on" position; Permanent fault if, automatic circuit unsuccessful reclosing, separating brake, automatic circuit is unsuccessful reclosing again, separating brake again, circuit decompression, F1 reaches the counts automatic brake separating of adjusting 3 times, and isolated fault L2 section is recovered the power supply of circuit L1 section after automatic circuit overlaps;

Sub-switching operation is first by spring mechanism (12) energy storage, and after mechanism's energy storage, mark arrow will be indicated energy storage state, operation switch lever, and spring mechanism (12) will drive rotating shaft (2) rotation 65 degree to make switch in closing position; After sectionaliser closes a floodgate, on/off switch arrow will point to closing position;

In the time there is being greater than the fault current of specified starting current in circuit, electronic controller starts to start, when after upper level switch separating brake, electronic controller in sectionaliser starts counting, sectionaliser completes after the counts of regulation, when electric current in circuit is less than 300mA, controller provides the actuating coil of a signal of telecommunication supply permanent magnet mechanism, drive moving unshakable in one's determination ejection of permanent magnet mechanism, lead agency is threaded off, spring mechanism (12) tripping spring discharges, sectionaliser separating brake, total opening time is not more than 100mS, until upper level switch again when reclosing fault section be isolated, but not fault section puts into operation, after staff gets rid of fault, the energy accumulation handle of leaving behind, closing by hand, recovers circuit operation again,

Get rid of when upper level switch transient fault after reclosing, sectionaliser does not reach again the counts of regulation, and circuit is power supply as usual, is restored to original state through sectionaliser after 20S resetting time.