CN212380344U - Novel high-voltage outdoor vacuum switch - Google Patents

Abstract

The utility model relates to a novel outdoor vacuum switch of high pressure of using in the high tension switchgear electrical field, especially the design has insulating plug head of short circuit ground connection, alternate connection insulating plug head (27). This novel outdoor vacuum switch of high pressure includes: a resonance-suppressing voltage transformer (52); a plug-in current transformer (54) dedicated for low current measurement; and an observation window (37) designed for observing the state of the isolating switch. Because the built-in plug-in head is used, the insulation test can be carried out without opening the cover plate, and only the protective cover is opened, so that the acceptance test is simple and easy to implement. The pluggable current transformer (54) is used, and the combined current transformer and voltage transformer are saved. The observation window (37) is arranged, so that misoperation can be effectively avoided.

Description

Novel high-voltage outdoor vacuum switch

Technical Field

The utility model relates to a novel outdoor vacuum switch of high pressure (3.6kV ~ 40.5kV), especially outdoor totally enclosed, totally insulated high-pressure vacuum switch.

Background

Currently, known high-voltage outdoor vacuum switches are characterized as follows:

when the voltage transformer (which is also used for voltage acquisition) is built-in, if a zero-sequence voltage signal is required to be acquired, the tail end of a three-phase high-voltage coil is grounded after short circuit, so that the following problems are brought:

a. when an insulation withstand voltage test is carried out on site, if a frequency doubling power supply does not exist, the tail end of the high-voltage coil must be removed from the ground, and enough space is ensured above the ground for carrying out the test;

b. the whole sealed box body is opened when the grounding wire is dismantled (the inside of the box body cannot be guaranteed to be free from condensation when the box body is not sealed), sealing is carried out again after a test, and the sealing condition consistent with that when the box body leaves a factory is difficult to guarantee.

Secondly, when the voltage transformer (which is also used for voltage taking) is built-in, if zero sequence voltage signals are not required to be taken, as long as three-phase voltage signals are required, the tail end of the high-voltage coil of the voltage transformer of the phase A is connected with the tail ends of the high-voltage coil of the phase B (without the voltage transformer of the phase B) and the high-voltage coil of the phase C, and the tail ends are not grounded, so that the three-phase voltage signals can be measured on the secondary side. This also brings about the following problems:

a. when an interphase insulation and voltage withstand test is carried out on site, the connecting wire at the tail end of the high-voltage coil must be dismantled, and enough space is ensured to be above the ground for carrying out the test;

b. the whole sealed box body is opened when the connecting line is dismantled (the inside of the box body cannot be guaranteed to be free from condensation when the connecting line is not sealed), sealing is carried out again after a test, and the sealing condition consistent with that when the box body leaves a factory is difficult to guarantee.

c. The occupied space is very large, and the volume of the whole machine is overlarge.

When the power system generates ferromagnetic resonance, high-frequency components are sensed to the secondary side, so that the zero-sequence voltage sampling loop generates very high voltage, and the protective equipment is burnt. Meanwhile, resonance can also generate low-frequency components, and because a primary loop of the voltage transformer presents low impedance to low-frequency signals, current is overlarge, and a fuse or the voltage transformer is burnt. Because the high-voltage outdoor vacuum switch is small in size and inconvenient to maintain, the primary harmonic elimination device is difficult to install, and the secondary harmonic elimination device is not ideal in effect.

And fourthly, when the load current is less than 200A, the measurement accuracy of the one-time through type current transformer is reduced, the requirement of metering and charging cannot be met, and the current transformer attached to the high-voltage outdoor vacuum switch can only be through once (namely, the number of turns of a coil can only be one) due to the limitation of space. The current method is as follows: a combined current and voltage transformer is arranged beside the high-voltage outdoor vacuum switch and is specially used for metering. And a charge control metering box is arranged to control the high-voltage outdoor vacuum switch to be switched off after the charge is insufficient. This results in an excessively large occupied space, cumbersome installation and high cost.

Due to the fact that the capacity of the vacuum arc extinguish chamber for isolating the static voltage is weak, the electricity can be tested successfully only after the isolating switch needs to be turned on after power failure. If the isolating switch is externally arranged, the isolating fracture can be obviously visible and safely operated, but the isolating switch contact is seriously oxidized under the influence of the environment, so that the probability of accidents such as contact heating is increased. If the isolating switch is built in, the problem that the isolating switch contact is rapidly oxidized due to environmental influence can be solved, but the isolating fracture is difficult to be obviously visible, the isolating switch is safely operated, and the state of the isolating switch can be judged only by depending on an external pointer.

SUMMERY OF THE UTILITY MODEL

Technical scheme

An object of the utility model is to provide a novel outdoor vacuum switch of high pressure for solving above-mentioned defect.

This novel outdoor vacuum switch of high pressure includes: left side insulators (divided into three phases); right side insulators (divided into three phases); an outgoing line; an insulated pull rod cavity; a current transformer; a voltage transformer and a fast fuse; electronic voltage transformers (also called voltage sensors); a vacuum arc-extinguishing chamber; opening and closing the main shaft; a contact pressure spring; a crank arm; an isolator cavity; a moving contact of the rotary isolating switch; an isolation switch insulating shaft; a zero sequence current transformer; an insulating pull rod; a spring contact finger; an insertion type current transformer; a short circuit ground plug; connecting the plug head; a resonance eliminating voltage transformer; a disconnector viewing window, etc.

Foretell outdoor vacuum switch of novel high pressure, its characterized in that, this outdoor vacuum switch of high pressure still includes: the tail end of a high-voltage coil of the voltage transformer is directly grounded through an insulation plug head or grounded through a harmonic elimination voltage transformer, and a special insulation plug head is also used for interphase connection; the resonance eliminating voltage transformer is connected with the voltage transformer by adopting a conical head, and a contact interface is sealed by flexible silicon rubber; each phase of a main loop of the high-voltage outdoor vacuum switch is connected with a plug-in current transformer in series, and the plug-in current transformer is specially used for measuring and protecting small current (below 200A), and because the number of turns of a primary coil of the current transformer can be adjusted according to needs, enough exciting current is ensured, and the metering precision is easily ensured; an observation window (made of explosion-proof glass) is arranged on a bottom plate of the high-voltage outdoor vacuum switch, and the state of the isolating switch can be directly observed by means of lamplight.

Advantageous effects

Firstly, a short-circuit grounding insulation plug head is used, and a voltage withstand test can be carried out without opening a cover plate of the whole machine;

secondly, an interphase connection insulation plug head is used, and an interphase voltage withstand test can be carried out without opening a cover plate of the whole machine;

a primary harmonic elimination voltage transformer is arranged in the transformer, so that harm caused by ferromagnetic resonance is avoided;

the built-in plug-in current transformer solves the problems of small current measurement and insufficient measurement precision, and does not use an external voltage and current combined type measurement transformer with large volume. The plug-in structure is very convenient to replace and maintain;

the observation window is arranged on the bottom plate of the high-voltage outdoor vacuum switch, the state of the isolating switch can be directly observed by light, and the possibility of misoperation is avoided.

Drawings

FIG. 1 is a main sectional view of a conventional feeder type of the high voltage outdoor vacuum switch;

FIG. 2 is an axial view of a conventional feeder type of the high voltage outdoor vacuum switch;

FIG. 3 is a front sectional view of a general ring network type of the high voltage outdoor vacuum switch;

FIG. 4 is an axial view of a general looped network type of the high voltage outdoor vacuum switch;

FIG. 5 is a front cross-sectional view of the high voltage outdoor vacuum switch detuning feeder type;

FIG. 6 is a cross-sectional view of the high-voltage outdoor vacuum switch harmonic elimination loop network type;

FIG. 7 is an axial view of the high voltage outdoor vacuum switch detuning ring network type;

FIG. 8 is a front sectional view of a conventional metering type of the high voltage outdoor vacuum switch;

FIG. 9 is a front cross-sectional view of the high voltage outdoor vacuum switch harmonic elimination metering type;

fig. 10 is an axial view of the high voltage outdoor vacuum switch harmonic elimination metering type.

In the figure: 1-the side of the outlet is connected with a terminal; 2-a lead-out side conductor; 3-a zero sequence current transformer; 4-current transformer at the outgoing line side; 5-left insulator (phase B); 6-outlet side electronic voltage transformer (also called sensor); 7-a lever; 8-an insulating pull rod; 9-contact pressure spring; 10-crank arm; 11-switching the main shaft; 12-an insulated pull rod cavity; 13-spring contact fingers; 14-silicone rubber insulating spacers; 15-an incoming line side electronic voltage transformer; 16-an upper cover plate; 17-fast fuse for voltage transformer; 18-incoming line side current transformer; 19-incoming line side voltage transformer (electromagnetic voltage transformer or power-taking capacitor); 20-a line-incoming side conductor; 21-umbrella skirt at inlet and outlet ends; 22-incoming line side connection terminal; 23-a vacuum arc-extinguishing chamber; 24-right side insulator (phase B); 25-arc extinguish chamber moving conducting rod; 26-plug head housing; 27-short circuit grounding insulation plug-in head or interphase connection insulation plug-in head; 28-a ground contact compression spring; 29-leading out a pressure spring from the tail end of the high-voltage coil of the voltage transformer; 30-a lower cover plate; 31-leading out a conductor from the movable end of the arc extinguish chamber; 32-static contact at the wire inlet side; 33-the isolating contact compresses the disc spring; 34-moving contact of rotary isolating switch; 35-moving contact insulating coating layer; 36-isolator insulating shaft; 37-observation window; 38-sealing ring; 39-pressing the frame; 40-isolating switch cavity; 41-fixed contact at outlet side; 42-a shielding mesh; 43-an operating mechanism; 44-a manual energy storage handle; 45-switch operating handle; 46-disconnecting switch operating handle; 47-front side panel; 48-rear side plate; 49-outlet side voltage transformer (three-phase type V/V connection method); 50-upper cover plate (for ring net type); 51-a harmonic elimination voltage transformer housing; 52-harmonic elimination voltage transformer; 53-upper cover plate (metering type use); 54-plug-in current transformer; 55-primary coil wire; 56-silicone rubber sleeve; 57-connecting contact fingers; 58-binding spring; 59-main loop conductor; 60-three-phase connection plug.

Detailed Description

This novel outdoor vacuum switch of high pressure includes:

(1) the outgoing side terminal 1-is connected with an external primary lead;

(2) the outgoing line side conductor 2-is used for internal conduction;

(3) the zero sequence current transformer 3-is used for measuring the zero sequence current;

(4) the outgoing line side current transformer 4-is used for measuring current;

(5) the left insulator (phase B in the figure) 5-serves as support and insulation. The whole insulator is divided into a left insulator and a right insulator by the limitation of the processing technology, and each side insulator is divided into A, B, C three phases again so as to be processed and manufactured;

(6) the electronic voltage transformer 6-on the outgoing line side is used for measuring voltage;

(7) lever 7-for transmission;

(8) insulating pull rod 8-for insulating transmission;

(9) a contact pressure spring 9 is used for ensuring enough contact pressure between a moving contact and a static contact of the vacuum arc extinguish chamber (23);

(10) crank arm 10-for transmission;

(11) the switch main shaft 11-drives the three-phase vacuum arc-extinguishing chamber (23) to act rapidly;

(12) the insulating pull rod cavity 12 is used for internally arranging an insulating pull rod (8);

(13) the spring contact finger 13-movable end lead-out conductor (31) is in sliding contact with the movable conducting rod (25) of the arc extinguish chamber;

(14) the silicon rubber insulating gasket 14-plays a role in sealing and insulating;

(15) the electronic voltage transformer 15-for measuring the phase voltage and the zero sequence voltage of the incoming line side;

(16) upper cover plate 16-for sealing protection;

(17) fast fuse 17 for voltage transformer, for protecting voltage transformer 19

(18) The current transformer 18-at the incoming line side is used for measuring current;

(19) an incoming line side voltage transformer (electromagnetic voltage transformer or power-taking capacitor) 19-measures voltage and provides operating power or float charges the battery;

(20) the lead-in side conductor 20-is used for internal conduction;

(21) the inlet and outlet end umbrella skirt 21-increases the creepage distance;

(22) the incoming line side terminal 22-is connected with an external primary lead;

(23) the vacuum arc-extinguishing chamber 23-is opened and closed for normal current and short-circuit current;

(24) the right insulator 24-serves as support and insulation. The whole insulator is divided into a left insulator and a right insulator by the limitation of the processing technology, and each side insulator is divided into A, B, C three phases again so as to be processed and manufactured;

(25) the arc extinguish chamber moving conducting rod 25-is used for leading out;

(26) plug head housing 26-for protecting plug head 27;

(27) the short circuit grounding insulation plug head or interphase connection insulation plug head 27-used for the short circuit grounding or interphase connection of the tail end of the high-voltage coil of the voltage transformer;

(28) the grounding contact pressure spring 28 is used for grounding contact;

(29) a pressure spring 29 is led out from the tail end of the high-voltage coil of the voltage transformer for electric connection;

(30) lower cover plate 30-for sealing protection;

(31) the leading-out conductor 31 of the arc extinguish chamber movable end is used for leading-out wires of the vacuum arc extinguish chamber 23;

(32) the static contact 32-of the incoming line side is connected with the movable contact 34 of the rotary isolating switch;

(33) the isolating contact compresses the disc spring 33 to keep the moving contact (34) of the isolating switch and the static contacts (32) and (41) to have enough pressure;

(34) the moving contact 34-of the rotary isolating switch has the functions of connection conduction and isolation;

(35) a moving contact insulating coating layer 35-strengthens the insulating function;

(36) the isolating switch insulating shaft 36 is used for transmission and insulation;

(37) observation window 37-for observing the state of the disconnector;

(38) sealing ring 38-sealing function;

(39) pressing frame 39-fixing observation window;

(40) the isolating switch cavity 40 is used for placing an isolating switch;

(41) the fixed contact 41-on the outgoing line side is connected with the movable contact 34 of the rotary isolating switch;

(42) shielding mesh 42-uniform voltage for partial discharge reduction;

(43) the operation mechanism 43-switch and the isolating switch are operated and interlocked;

(44) manual energy storage handle 44-for manual energy storage;

(45) switch operating handle 45-for operating the switch;

(46) disconnector operating handle 46-for operating the disconnector;

(47) front side plate 47-ultraviolet protection from insulator and protection;

(48) the rear side plate 48 has the functions of preventing ultraviolet rays from irradiating the insulator and protecting;

(49) a voltage transformer (three-phase V/V connection method) 49-used for measuring voltage and providing power supply during reverse power transmission;

(50) an upper cover plate (for a ring net type) 50-for protection;

(51) the outer cover 51 of the resonance elimination voltage transformer is used for protection and grounding;

(52) resonance elimination voltage transformer 52-for eliminating grid resonance;

(53) upper cover plate (for metering use) 53-for protection;

(54) plug-in current transformer 54-for small current measurements;

(55) primary coil wire 55-primary coil for external connection;

(56) the silicone rubber sleeve 56-for interface sealing and insulation;

(57) connecting contact fingers 57-two hard conductors for movable connection;

(58) spring 58-to ensure sufficient pressure on the fingers;

(59) the main loop conductor 59-the arc extinguish chamber static end and the plug-in current transformer (54) are electrically connected;

(60) the three-phase connection plug head 60-is connected with A, C two-phase voltage transformer high-voltage coil tail end and B phase conductor to form V/V wiring mode.

The invention will be further described with reference to the following figures 1 to 10 and examples:

1. the novel high-voltage outdoor vacuum switch has the structural key points that:

firstly, a short-circuit grounding insulation plug head (27) is used at the tail end of a high-voltage coil of a voltage transformer (19), a whole machine cover plate is not required to be opened during a field acceptance test, and a voltage withstand test can be carried out by pulling out the plug head, namely: the voltage transformer is of a full insulation type;

secondly, an interphase connection insulation plug head (27) is used, an overall machine lower cover plate (30) is not required to be opened during a field acceptance test, and an interphase voltage withstand test can be carried out by pulling out the plug head (27), and the following steps are carried out: the B-phase voltage transformer is replaced by an insulated conductor;

a built-in and externally-hung primary harmonic elimination voltage transformer (52) is used, so that the damage caused by electromagnetic resonance is avoided, and the replacement and maintenance are very convenient;

the built-in plug-in current transformer (54) solves the problem of insufficient metering precision of small current, and the external voltage and current combined metering transformer with large volume is not used independently, but only one switch is used for realizing the functions of line protection, equipment protection, payment and power transmission, arrearage power failure and the like, so that the built-in plug-in current transformer has the characteristics of small volume and convenience in installation and use, and the manufacturing cost is also reduced;

the observation window (37) is arranged on the bottom plate of the high-voltage outdoor vacuum switch, the state of the isolating switch (34) can be directly observed by light, and the possibility of misoperation is avoided.

2. The switching-on and switching-off processes of the vacuum switch are as follows:

fig. 1 shows the switch in the closed state. Under the drive of the operating mechanism (43), the switch main shaft (11) rapidly rotates clockwise to drive the connecting lever (10) to rotate clockwise, then the lever (7) is driven to rotate clockwise, and finally the insulating pull rod (8) is driven to move leftwards to separate the moving contact and the static contact of the vacuum arc extinguish chamber (23) at a certain distance, so that the brake opening is completed. On the contrary, under the driving of the operating mechanism (43), the switch main shaft (11) rapidly rotates anticlockwise to drive the crank arm (10) to rotate anticlockwise, and the lever (7) finally drives the insulating pull rod (8) to move rightwards until the moving contact and the static contact in the arc extinguishing chamber are contacted and keep a certain pressure under the action of the contact pressure spring (9) (see figure 1), so that the closing is completed.

3. Switching-on and switching-off process of isolating switch

Fig. 1 shows a state of the disconnecting switch after closing, and fig. 8 shows a state of the disconnecting switch after opening. During opening, the isolating switch insulating shaft (36) rotates clockwise by 90 degrees to drive the two ends of the rotary isolating switch moving contact (34) to be simultaneously separated from the isolating switch static contacts (32) and (41), and an isolating fracture is formed between the two static contacts (32) and (41). When the switch is switched on, the switch rotates anticlockwise by 90 degrees, and the two ends of the movable contact (34) of the rotary isolating switch are driven to be simultaneously connected with the fixed contacts (32) and (41) of the isolating switch, so that a loop is formed on the two sides of the wire inlet and the wire outlet, and the switch is switched on.

Claims (4)

1. Novel outdoor vacuum switch of high pressure, its characterized in that includes: the tail end of a high-voltage coil of the built-in three-phase voltage transformer consisting of three independent voltage transformers (19) is grounded after being short-circuited by a short-circuit grounding insulation plug head (27), and the tail end of the high-voltage coil of the built-in three-phase voltage transformer consisting of two independent voltage transformers is connected by an interphase connection insulation plug head (27).

2. The novel high-voltage outdoor vacuum switch according to claim 1, characterized in that it further comprises: a resonance elimination voltage transformer (52) which is externally hung and inhibits resonance is arranged in the transformer.

3. The novel high-voltage outdoor vacuum switch according to claim 1, characterized in that it further comprises: a plug-in current transformer (54) is connected in series with the conductive main loop.

4. The novel high-voltage outdoor vacuum switch according to claim 1, characterized in that it further comprises: the lower cover plate (30) is provided with a hole and an isolating switch observation window (37).

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