CN110749837A

CN110749837A - Manual seesaw type self-checking switching device and high-voltage switch room grounding alarm

Info

Publication number: CN110749837A
Application number: CN201911038331.3A
Authority: CN
Inventors: 王立; 张海青; 张勇
Original assignee: Yangquan Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Current assignee: Yangquan Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-02-04
Anticipated expiration: 2039-10-29
Also published as: CN110749837B

Abstract

The invention relates to a grounding alarm technology of a high-voltage switch room system, in particular to a manual seesaw type self-checking switching device and a grounding alarm of a high-voltage switch room. The manual seesaw type self-checking switching device designed by the invention has the advantages that one path is connected with a self-checking power supply, the voltage is output by a voltage regulator according to requirements, a coil of an adjustable voltage relay is triggered, a normally open contact of the adjustable voltage relay is closed, and an audible and visual alarm gives out sound and light to alarm, so that the self-checking function is realized. And the other path is connected with an opening triangular terminal of a terminal block in an instrument room of the voltage transformer cabinet, when the system has a ground fault, the voltage of the opening triangular 3U0 of the voltage transformer rises to exceed a setting value, a coil of the adjustable voltage relay is triggered, a normally open contact of the adjustable voltage relay is closed, and the audible and visual alarm gives out sound and light for alarming. And prompting the field operating personnel that the system has a ground fault, and immediately stopping working and withdrawing to a safety zone.

Description

Manual seesaw type self-checking switching device and high-voltage switch room grounding alarm

Technical Field

The invention relates to a grounding alarm technology of a high-voltage switch room system, in particular to a manual seesaw type self-checking switching device and a grounding alarm of a high-voltage switch room.

Background

The electrified test items of the existing switch cabinet are as follows: transient earth voltage, ultrasonic waves and ultrahigh frequency. Regardless of the test item, the tester needs to touch the surface of the switch cabinet for a long time. The partial discharge signal of the switch cabinet is easily influenced by an external interference signal, so that anti-interference measures such as closing doors and windows, fluorescent lamps and ventilation motors need to be taken.

In a switch room for closing doors and windows and fluorescent lamps, a tester needs to take a long time to detect, and if an abnormal partial discharge signal is found, the tester needs to test and position for a longer time. The system is likely to have ground fault at any time, if the ground fault happens really, a dangerous area is formed in a switch room for closing doors and windows and lamplight, a great personal safety problem can be brought to a tester who stays for a long time, and particularly, the tester does not know that the system has the ground fault. At present, the transformer substations of 500kV and below all adopt an unattended mode, when a system in a switch room has a ground fault, a signal can be sent to a remote background (a regulation and control center), and no alarm signal is on site, namely, even if a tester is testing in the switch room, the tester can hardly find the ground fault, only when the regulator finds the ground signal, the tester stops working and withdraws from the switch room through telephone notification, and the tester can completely run out of danger in the period of time without self-knowledge. A ground fault in a switchhouse system poses a safety threat not only to live test personnel, but also to all personnel present therein.

Disclosure of Invention

The invention provides a manual seesaw type self-checking switching device and a high-voltage switch room grounding alarm, aiming at solving the technical problem that potential safety hazards exist in personnel due to the fact that an alarm device is lacked when a high-voltage switch room system is tested at present.

The manual seesaw type self-checking switching device is realized by adopting the following technical scheme: a manual seesaw type self-checking switching device comprises an insulating base, a ball limiting device and a supporting plate are arranged along one central line of the insulating base, and a pair of inclined static contact seats which are symmetrical to each other are arranged along the other central line of the insulating base; the insulating base is provided with a closed position lamp static contact at one side of the pair of inclined static contact seats close to the outside; a pair of linked seesaw type movable cutter arms is arranged on the insulating base between the ball limiting device and the supporting plate through a seesaw fixing point, and a rotating shaft of each seesaw type movable cutter arm is parallel to the central line of the ball limiting device and the central line of the supporting plate; the 'seesaw' type movable cutter arm has three positions of a self-checking power supply position, a middle position and a voltage transformer opening triangle, a seesaw fixed point and the 'seesaw' type movable cutter arm are connected and conducted through rivets, a plurality of soft copper wire jumpers are welded between the 'seesaw' type movable cutter arms for bridging connection, and the ends of the jumpers are crimped at the seesaw fixed point; the teeterboard fixing point is connected with an outlet wire for connecting a voltage regulator; both ends of the seesaw-type moving knife arm are provided with a closed position lamp moving contact matched with the closed position lamp fixed contact; the pair of oblique fixed contact seats are oppositely inclined, a group of oblique fixed contacts are fixed on each oblique fixed contact seat, and the two groups of oblique fixed contacts are respectively connected with an outgoing line and are respectively connected to a self-checking power supply and a voltage transformer opening triangle; the inclined static contact is inclined at a certain angle, and the angle can enable the inclined static contact to be parallel to the moving knife arm when the inclined static contact is positioned at the middle position of the seesaw type moving knife arm;

the two groups of movable cutter arms are connected and fixed into a whole through bolts and an insulating plate, a 'wing-shaped' linkage plate is fixed in the middle of the insulating plate through the bolts, a square hole is formed in the middle of the 'wing-shaped' linkage plate, and a square transmission rod penetrates through the square hole and is fixed; the ball limiting device comprises a vertical plate arranged on the insulating bottom plate, an arc-shaped groove of the ball limiting device is formed in the vertical plate, three ball limiting pits are arranged on the lower portion of the arc-shaped groove in an arc shape and limit positions corresponding to the self-detection power supply position, the middle position and the voltage transformer opening triangle of the seesaw type movable cutter arm respectively; the lower part of the arc-shaped groove is provided with a rivet hole which is connected with a limit link rod through a rivet; a ball limiting rod is welded at the position of the limiting link rod corresponding to the ball limiting pit, a spring is arranged in the ball limiting rod, a ball is arranged at the end part of the ball limiting rod, a limiting rod is arranged at the position of the limiting link rod corresponding to the arc-shaped groove, one end of the limiting rod is connected with the limiting link rod through threads, a cap is arranged at the end part of the other end of the limiting link rod, a section of neck with a reduced diameter is arranged behind the limiting link rod, the neck is clamped in the arc-shaped groove, and the length of the neck; the upper part of the limiting link rod is provided with a square hole, one end of a square transmission rod is installed, the support plate is provided with an operating rod through a support plate fixing operating rod bolt, and the other end of the square transmission rod is installed on the operating rod.

The transformer substation switch room system has certain randomness when generating ground faults, and no field alarm device is arranged in the switch room, which brings great safety risk to the operating personnel in the switch room. Therefore, a grounding field alarm of a substation switch room system needs to be developed to solve the problem. The ground field alarm of the switch room system is developed to ensure normal function, if the conventional regular test mode is adopted, the normal work of the alarm in the test period cannot be ensured by 100 percent, once the alarm and a loop thereof have problems, the alarm cannot be given out due to the self problem when the alarm is supposed to be given out, so that the safety of a human body is greatly threatened, and the alarm cannot be allowed absolutely. The on-site alarm and the circuit thereof are normal after the self-checking is normal, the on-site alarm is connected with the three corners of the secondary opening of the voltage transformer in parallel, so that the on-site alarm can play a monitoring role normally, and the personnel enters the indoor equipment area to start working. Therefore, a simple manual seesaw type self-checking switching device needs to be developed to realize the self-checking function of the field alarm.

The manual seesaw type self-checking switching device designed by the invention has the advantages that one path is connected with a self-checking power supply (generally 220V of mains supply), voltage is output by a voltage regulator according to requirements, a coil of an adjustable voltage relay is triggered, a normally open contact of the adjustable voltage relay is closed, and an audible and visual alarm gives out sound and light to give an alarm, so that the self-checking function is realized. And the other path is connected with an opening triangular terminal (L, O) of a terminal block in an instrument room of the voltage transformer cabinet, when the system has a ground fault, the voltage of the opening triangular 3U0 of the voltage transformer rises to exceed a setting value, an adjustable voltage relay coil is triggered, a normally open contact of the adjustable voltage relay is closed, and an audible and visual alarm gives out sound and light to give an alarm. And prompting the field operating personnel that the system has a ground fault, and immediately stopping working and withdrawing to a safety zone.

The grounding alarm of the high-voltage switch chamber is realized by adopting the following technical scheme: a high-voltage switch room grounding alarm comprises a manual seesaw type self-checking switching device, an adjustable voltage relay, an audible and visual alarm, a test button, a single-phase air switch and a rectifier filter; the audible and visual alarm and the single-phase air switch are both connected in series in an alternating current loop of the adjustable voltage relay, and the test button is connected in parallel with a normally open contact of the adjustable voltage relay; the wiring of the fixed point of the seesaw is connected with a coil of the adjustable voltage relay through a rectifier filter.

The manual seesaw type self-checking switching device designed by the invention is suitable for occasions with strict requirements on double power supply locking, small occupied space, capability of manual switching, simple structure, safety, reliability, no maintenance and low cost.

Drawings

Fig. 1 is a schematic view of an insulating base and a portion of a stationary contact.

Fig. 2 is a schematic view of a portion of the movable contact of the lamp in a closed position.

Fig. 3 is a schematic view of a part of the limiting operation.

Fig. 4 is a schematic view of a stopper rod structure.

FIG. 5 is a schematic view of a ball retainer.

FIG. 6 is a schematic view of a "teeter-totter" type moving blade portion.

FIG. 7 is a schematic view of a "finned" linkage plate.

Fig. 8 is a schematic diagram of a manual seesaw type self-checking switching device.

Fig. 9 is a schematic wiring diagram of a manual seesaw type self-checking switching device.

Fig. 10 is a perspective view of the manual "see-saw" type self-checking switch device.

Fig. 11 is a physical appearance diagram of the manual seesaw type self-checking switching device.

Fig. 12 voltage transformer wiring principle is illustrated schematically.

Fig. 13 is a wiring schematic diagram of an opening triangular installation alarm of the voltage transformer.

FIG. 14 is one of the AC and DC signal diagrams of the on-site alarm of the switchhouse system.

FIG. 15 is a second AC/DC signal diagram of the on-site alarm for the switching room system.

Fig. 16 is a schematic wiring diagram of the switch room system ground field alarm.

Fig. 17 is a perspective view of the wiring of the switch room system ground field alarm.

Fig. 18 is a pictorial view of a switch room system ground field alarm.

Fig. 19 'seesaw' type switching device realizes a self-checking function switch room system grounding field alarm.

Fig. 20 is a schematic diagram of a switching room system grounding field alarm with a self-checking function installed in a voltage transformer cabinet instrument room by using a seesaw type switching device.

Fig. 21 is a schematic diagram of the switch room arrangement of the alarm in the grounding field of the switch room system with the self-checking function realized by the seesaw type switching device.

1-closed position lamp static contact, 2-oblique static contact seat, 3-oblique static contact, 4-insulating base, 5-ball limiting device, 6-ball limiting device arc-shaped groove, 7-ball limiting pit, 8-supporting plate, 9-supporting plate bolt fixing hole, 10-bolt hole, 11-closed position lamp moving contact, 12-closed position lamp moving contact part, 13-wiring, 14-positioning pin 1, 15-limiting link rod, 16-limiting rod, 17-ball limiting rod, 18-rivet, 19-supporting plate fixing operating rod bolt, 20-operating rod, 21-positioning pin 2, 22-square transmission rod, 23- "seesaw" type moving cutter arm I, 24-outgoing wire, 25-seesaw rivet fixing point, 26-jumper wire, 27-moving cutter arm connecting rod, 28- "seesaw" type moving cutter arm II, 29-insulating plate, 30- "fin" linkage plate, 31-fixing plate, 32-manual 'seesaw' type self-checking switching device, 33-fuse (air switch) 1, 34-fuse (air switch) 2, 35-voltage regulator, 36-cable, I-power supply 1 (self-checking power supply), II-power supply 2 (voltage transformer open triangle), III-load (adjustable voltage relay), 37-self-checking power supply closed position lamp, 38-voltage transformer open triangle closed position lamp, 39-manual 'seesaw' type self-checking switching device mounting base, 40-voltage regulator circuit board, 41-voltage regulator fuse, 42-voltage regulator adjusting knob, 43-voltage regulator voltage liquid crystal display, 44-wiring terminal row 1, 45-manual 'seesaw' type self-checking switching device, 46-primary winding, 47-iron core, 48-secondary winding, 49-secondary auxiliary winding (open triangle), 50-fuse or single-phase air switch, 51-alarm, 52-adjustable voltage relay, 53-test button, 54-audible and visual alarm, 55-adjustable voltage relay connecting terminal, 56-rectifier filter, 57-connecting terminal row 2, 58-adjustable voltage relay voltage regulating button, 59-switch room system grounding field alarm, 60-voltage transformer cabinet instrument room, 61-connecting terminal row 3, 62-switch room gate, 63-indoor cable trench and 64-cable.

Detailed Description

With reference to fig. 1 to 21, the present invention mainly comprises two parts: firstly, a switch room system grounding field alarm; and secondly, a manual seesaw type self-checking switching device.

The switch room system grounding field alarm mainly comprises the following parts:

1. adjustable voltage relay: when the input voltage is larger than the setting value, the relay acts, and the normally open contact is closed. In order to ensure the reliable action of the contact, the active adjustable voltage relay is connected with a direct current power supply.

2. Audible and visual alarm: the normally open contact of the adjustable voltage relay is closed, and the audible and visual alarm is started.

3. Test button: and the adjustable voltage relay is connected in parallel with a normally open contact, and the audible and visual alarm can be tested by pressing.

4. And the single-phase air switch is connected in series in the alternating current loop of the adjustable voltage relay to protect the adjustable voltage relay and prevent the secondary short circuit of the voltage transformer.

5. A rectifier filter: the self-checking power supply outputs direct current through the rectifier filter to be used as a direct current power supply of the adjustable voltage relay.

The switch room system grounding field alarm has two installation modes:

a method for installing each component in a cuboid box (the front and back covers can be disassembled), installing the box as a whole, opening a rectangular hole in the middle of the front cover, welding a screw rod up and down on the back of the rectangular hole, and installing the upper and lower two componentsThe root screw rods are respectively connected through screws "The shaped pull rod passes through the rectangular hole and the two "

The' shaped pull rod fixes the adjustable voltage relay. The left side of the rectangular hole in the middle of the front cover is provided with a round hole, the audible and visual alarm is installed, and the right side of the rectangular hole is provided with a round hole and a test button. The left side of the rear cover is provided with a rectangular hole, and a single-phase air switch is installed and can be operated from the outside. The rectifier filter and the wiring terminal block 2 are arranged inside, a circular hole is formed in the bottom of the right side of the rear cover, and a cable is led out from the circular hole.

The other type is that all the components are installed in an instrument room of a voltage transformer cabinet, an audible and visual alarm and a test button are installed on an instrument room door, and an adjustable voltage relay, a single-phase air switch and a rectifier filter are installed in the instrument room.

The manual seesaw type self-checking switching device comprises the following parts:

1. a seesaw type movable cutter arm: by utilizing the principle of a seesaw, one end is closed, and the other end is opened inevitably, so that the two power supplies are closed mutually, and an electrically obvious disconnection point is formed between the two power supplies. The device comprises three positions of a self-checking power supply position, a middle position and a voltage transformer opening triangle. The two groups of movable cutter arms are connected and fixed into a whole through bolts and an insulating plate, a 'wing' -shaped linkage plate is fixed in the middle of the insulating plate through bolts, and a square hole is formed in the middle of the 'wing' -shaped linkage plate. The 'seesaw fixing point' and the 'seesaw' moving cutter arms are connected and conducted through rivets, the 'seesaw' moving cutter arms are welded with a plurality of soft copper wire jumpers in a bridging connection mode, the jumper wire end is in crimping connection with a bolt at the 'seesaw fixing point', and a connecting outlet at the 'seesaw fixing point' is connected with an adjustable voltage relay through a single-phase air switch.

2. Oblique static contact: the inclined static contact is inclined by a certain angle, the movable cutter arm can be parallel to the inclined static contact and the seesaw type movable cutter arm when the inclined static contact is at the middle position of the movable cutter arm, and two groups of inclined static contacts are arranged at the inclined static contact at the self-checking power supply position and the opening triangular inclined static contact of the voltage transformer. The two groups of oblique fixed contacts are respectively connected with outgoing lines and respectively connected to a self-checking power supply and a voltage transformer opening triangle, a cable is led to the back of the insulating base through an opening on the insulating base, and a cable connector is connected with a wire clamp in a compression joint mode through a bolt.

3. Insulating base: a fixed seesaw type movable cutter arm, an inclined static contact and the like.

4. A square transmission rod: the square transmission rod penetrates through a square hole in the middle of the 'wing-shaped' linkage plate to realize transmission, two pin holes are formed in the front and the back of the square transmission rod, the positioning pin 2 is located on the outer side of the operating rod, the positioning pin 1 is located on the outer side of the limiting link rod, and the square transmission rod is firmly installed through the positioning pin 1 and the positioning pin 2.

5. A support plate: the lower transverse plate is fixed on the insulating base through bolts, and the upper part of the lower transverse plate is provided with bolt fixing holes.

6. An operating rod: the middle part is fixed in the bolt fixing hole of the supporting plate through a bolt. The upper part is connected with a square transmission rod through a square. So as to realize the operation of the seesaw type movable cutter arm.

7. Ball stop device: the lower transverse plate is fixed on the insulating base through bolts, the vertical plate is provided with an arc-shaped groove of the ball limiting device, the lower part of the arc-shaped groove is provided with three ball limiting pits which are arranged in an arc shape and respectively limit the position corresponding to the self-detection power supply position, the middle position and the three positions of the opening triangle of the seesaw type movable cutter arm. And the lower part is provided with a rivet hole which is connected with a limit link rod through a rivet. The position of the limiting link rod corresponding to the ball limiting pit is welded with a ball limiting rod, a spring is arranged in the ball limiting rod, and the end of the ball limiting rod is provided with a ball. The ball gag lever post is equipped with the gag lever post corresponding to the arc wall position, screw thread and spacing link connection are passed through to this gag lever post one end, the adjustable gag lever post length of this screw thread, the other end, the tip has the cap, be one section "neck" that diminishes the diameter behind it, this "neck" card is gone into in the arc wall, "neck" length and ball cooperation, spacing link upper portion is opened there is "side", the installation side transfer line, insert back with locating pin 1 and locating pin 2, "neck" is in the arc wall position, just be in the intermediate position of its length, ball pressure is suitable, it is spacing to realize the three positions, in addition, self-checking power supply position can also be played to arc wall both sides extreme position, spacing of two positions of voltage transformer opening triangle, the intermediate position can only realize spacingly through the ball.

8. Closing the stationary contact part of the position lamp: the structure of the cable connector is the same as that of the oblique fixed contact, the two sets of the cable connector are respectively arranged at two ends of an insulating base, a cable is led to the back of the insulating base through an opening on the insulating base, and the cable connector is connected with the cable connector in a compression mode through a wire clamp and a bolt.

9. Closing the movable contact part of the position lamp: the middle of the structure is a strip copper plate, a pair of lugs with bolt holes are symmetrically arranged at two ends of the strip copper plate, the lugs are mounted on an insulating plate of a movable cutter arm through bolts, and a movable contact of a closed position lamp is arranged at the position corresponding to a fixed contact of the closed position lamp below the lugs.

10. A voltage regulator: the principle of stepless voltage regulation is realized by utilizing the electronic voltage regulator, and the self-checking power supply can be regulated to the required voltage to trigger the action of the adjustable voltage relay, so that the audible and visual alarm is started. The device consists of an adjusting knob, a liquid crystal display, a fuse and an internal circuit.

The manual seesaw type self-checking switching device is used for installing all the components in a cuboid box (the front cover and the rear cover can be detached), and the box is installed and used as a whole. The manual seesaw type self-checking switching device is arranged on the left portion of the box through a base, a fan-shaped hole is formed in the position, corresponding to a square transmission rod, of a front cover, the end portion of the square transmission rod extends out of one portion of the front cover, an operating rod is installed and a positioning pin 2 is inserted, and a supporting plate fixing operating rod bolt hole and a fixing operating rod are formed in the lower portion of the operating rod. Round holes are respectively formed in the two sides of the upper part of the self-checking power supply, and a self-checking power supply closed position lamp and a voltage transformer open triangle closed position lamp are respectively installed on the round holes; the voltage regulator is installed on the right part, a round hole is formed in the upper portion of the voltage regulator, a voltage regulator voltage liquid crystal display is installed on the upper portion of the voltage regulator, a round hole is formed in the middle of the voltage regulator, a voltage regulator adjusting knob is installed on the round hole, a rectangular hole is formed in the lower portion of the voltage regulator fuse, and a voltage regulator circuit board is installed on the rear portion. The wiring terminal block 1 is installed at the right side position inside the box, a round hole is formed at the left side position, and a cable is led out from the round hole.

When the ground fault occurs to the switch room system, the signal can be sent to a remote background, no alarm signal exists on the spot, great safety risk is brought to operating personnel in the switch room, the developed transformer substation switch room system ground field alarm can send out an audible and visual alarm signal when the system has the ground fault, the operating personnel is reminded to stop working and withdraw immediately, and the switch room system ground field alarm can be arranged in a voltage transformer cabinet instrument room. The manual seesaw type self-checking switching device is arranged at a doorway in the switch chamber, the manual seesaw type self-checking switching device and the manual seesaw type self-checking switching device are connected through a cable, an operator can operate an operating rod to switch the seesaw type self-checking switching device to a self-checking power position after entering the doorway in the switch chamber, and the self-checking power is switched on and then a position lamp is turned on to send out sound and light alarm. After normal self-checking, the seesaw type self-checking switching device is switched to the opening triangle position of the voltage transformer, at the moment, the position lamp is on after the opening triangle of the voltage transformer is closed, the grounding field alarm of the switch room system is put into operation, if the field alarm gives out sound and light alarm at the moment, the switch room system cannot enter the equipment area, the switch room system is immediately withdrawn to a safety zone and is in contact with a working licensor, the reason is found, and the switch room system enters the equipment area to operate after no danger is confirmed.

Manual "seesaw" formula self-checking auto-change over device has three positions: 1. the system comprises a self-checking power supply position, a voltage transformer opening triangular position, a switching room system grounding field alarm, a monitoring system state and a sound and light alarm, wherein the self-checking power supply position is used for self-checking of the system grounding field alarm, the 2 middle position is in a non-power state and is used for stopping and maintaining the device, and the 3 voltage transformer opening triangular position represents that the system grounding field alarm of the switching room is put into operation and monitors the system state, and.

The designed manual seesaw type self-checking switching device belongs to load isolating switches (PC grade), a contact system adopts unique seesaw type and double-pole double-throw design, and the contact has small opening distance and small volume; the design idea combines the advantages of a 'heel-and-toe brake' in a double-power switching structure, simple operation, safety and reliability, and the 'seesaw fixing points' and the 'seesaws' type movable cutter arms are connected and conducted through welding a plurality of strands of soft copper wire jumpers in a bridging manner, so that the conduction reliability is ensured, and the defects that the 'heel-and-toe brake' is conducted through rivets, has large contact resistance and is only suitable for occasions with small load current are overcome.

The designed manual seesaw type self-checking switching device is suitable for occasions with strict requirements on double-power locking, small occupied space, capability of manual switching, simple structure, safety, reliability, no maintenance and low cost.

As shown in fig. 1, which is a schematic view of an insulating base and a portion of an oblique static contact, an insulating base plate is visible in the figure, a support plate 8 and a ball limiting device 5 are fixed on a short center line of the insulating base plate, a combined rear position lamp static contact 1 is fixed on each of two short edges close to the insulating base plate, an oblique static contact base 2 is arranged on each of the combined rear position lamp static contacts 1, and a group of oblique static contacts 3 are arranged on each of the oblique static contact bases 2. The ball limiting device 5 comprises a transverse plate fixed on the insulating bottom plate and a vertical plate fixed on the transverse plate; the vertical plate is provided with an arc-shaped groove 6 of a ball limiting device and a ball limiting pit 7.

Fig. 2 is a schematic view of the movable contact part of the lamp in the closed position. The tool comprises a strip-shaped copper plate, wherein a pair of lugs with bolt holes are respectively arranged at two ends of the copper plate, and the bolt holes are used for being connected with a seesaw type movable cutter arm. A lamp moving contact 11 at the rear position after involution is arranged below the copper plate.

As shown in the schematic diagram of the limiting operation part in fig. 3. In the figure, an operating rod 20 is connected to the support plate through a support plate fixing operating rod bolt, a limiting link rod 15 is rotatably arranged on a vertical plate of the ball limiting device through a rivet 18, and a limiting rod 16 matched with the arc-shaped groove 6 of the ball limiting device and a ball limiting rod 17 matched with the ball limiting pit 7 are arranged on the limiting link rod 15.

Fig. 4 is a schematic view of the structure of the stop lever. One end of the limiting rod is provided with threads, the other end of the limiting rod is in a cap structure (movably connected), and the inward portion of the cap structure is in a neck structure with one end with a reduced outer diameter and is used for being clamped into the arc-shaped groove of the ball limiting device.

Fig. 5 is a schematic view of the ball retainer. The transverse plate is fixed with a vertical plate, the vertical plate is provided with a ball limiting device arc-shaped groove 6 and a ball limiting pit 7, the vertical plate is provided with a limiting link rod 15, and the limiting link rod 15 is connected with a limiting rod 16 and a ball limiting rod 17.

Fig. 6 is a schematic view of a seesaw type moving blade part. In the figure, a seesaw fixed point is arranged between the support plate and the ball limiting device, and a seesaw type moving cutter arm I23 and a seesaw type moving cutter arm II 28 are arranged at the seesaw fixed point through a seesaw fixed point rivet; the teeterboard type moving cutter arm I23 and the teeterboard type moving cutter arm II 28 are connected with the insulating plate through the moving cutter arm connecting rod, and the strip-shaped copper plate is connected.

Fig. 7 is a schematic view of a 'wing' linkage plate. The square connecting rod passes through the center of the wing-shaped linkage plate, and the connecting rods extend out of the left end and the right end of the wing-shaped linkage plate.

Fig. 8 is a schematic diagram of a manual seesaw type self-checking switching device. The wing-shaped linkage plate is connected with the insulating plate through the fixing plates fixed at the two ends of the connecting rod, and further linked with the seesaw type movable cutter arm. The seesaw type movable cutter arm can be switched among three positions by shifting the operating rod, and the limiting rod 16 and the ball limiting rod 17 are used for limiting in the three positions.

Fig. 9 is a schematic wiring diagram of a manual seesaw type self-checking switching device. One group of oblique static contact wiring is used for connecting a power supply 1 (self-checking power supply), the other group of oblique static contact wiring is used for connecting a power supply 2 (voltage transformer opening triangle) II, and an outgoing line connecting load (adjustable voltage relay) III is connected at a seesaw fixing point.

As shown in fig. 10 and 11, a rectangular box body is visible, and a self-checking power supply closing rear position lamp 37, a voltage transformer opening triangle closing rear position lamp 38, a voltage regulator adjusting knob 42 and a voltage regulator voltage liquid crystal display 43 are mounted on a front cover of the box body. In fig. 1, the connection wires are respectively led out from the box body.

Fig. 12 is a schematic diagram of the wiring principle of the voltage transformer, and fig. 13 is a schematic diagram of the wiring principle of the open triangle installation alarm of the voltage transformer, wherein a single-phase air switch and the alarm are connected with the secondary auxiliary winding (open triangle) of the voltage transformer.

Fig. 14 and 15 are diagrams of ac and dc signals of the switch room system grounding field alarm. Fig. 16 is a schematic diagram of the wiring of the switch room system grounding field alarm. The rectifying filter rectifies external alternating current into direct current, and then inputs the direct current to the adjustable voltage relay.

Fig. 17 and 18 show that the test button 53, the audible and visual alarm 54 and the adjustable voltage relay voltage adjusting button 58 are arranged on the front cover of the box body.

Fig. 19 'seesaw' type switching device realizes a self-checking function switch room system grounding field alarm. The two main components of the invention are respectively positioned in the two rectangular boxes.

Fig. 20 is a schematic diagram of a switch room system grounding field alarm device with a self-checking function installed in a voltage transformer cabinet instrument room by using a seesaw type switching device.

Fig. 21 is a schematic diagram of the switch room arrangement of the switch room system grounding field alarm for realizing the self-checking function of the seesaw type switching device.

Claims

1. A manual seesaw type self-checking switching device comprises an insulating base (4), and is characterized in that a ball limiting device (5) and a supporting plate (8) are arranged along one central line of the insulating base (4), and a pair of oblique stationary contact seats (2) which are symmetrical to each other are arranged along the other central line of the insulating base (4); a closed position lamp static contact (1) is respectively arranged on one outer side of the pair of inclined static contact seats (2) on the insulating base (4); a pair of linked seesaw type movable cutter arms is arranged on the insulating base (1) between the ball limiting device (5) and the supporting plate (8) through seesaw fixing points, and rotating shafts of the seesaw type movable cutter arms are parallel to the central lines of the ball limiting device (5) and the supporting plate (8); the 'seesaw' type movable cutter arm has three positions of a self-checking power supply position, a middle position and a voltage transformer opening triangle, a seesaw fixed point and the 'seesaw' type movable cutter arm are connected and conducted through rivets, a plurality of soft copper wire jumpers are welded between the 'seesaw' type movable cutter arms for bridging connection, and the ends of the jumpers are crimped at the seesaw fixed point; the teeterboard fixing point is connected with an outgoing line for connecting a voltage regulator (35); both ends of the seesaw-type moving knife arm are provided with a closed position lamp moving contact (11) matched with the closed position lamp fixed contact (1); the pair of inclined static contact seats (2) are inclined oppositely, a group of inclined static contacts (3) are fixed on each inclined static contact seat (2), and the two groups of inclined static contacts (3) are respectively connected with outgoing lines which are respectively connected to a self-checking power supply and a voltage transformer opening triangle; the oblique static contact (3) is inclined at a certain angle, and the angle can enable the oblique static contact (3) to be parallel to the movable cutter arm when the oblique static contact is positioned at the middle position of the seesaw type movable cutter arm;

the two groups of movable cutter arms are connected and fixed into a whole through bolts and insulating plates, a 'wing' -shaped linkage plate (30) is fixed in the middle of each insulating plate through the bolts, a square hole is formed in the middle of each 'wing' -shaped linkage plate (30), and a square transmission rod (22) penetrates through the square hole and is fixed; the ball limiting device (5) comprises a vertical plate arranged on the insulating bottom plate (4), an arc-shaped groove (6) of the ball limiting device is formed in the vertical plate, three ball limiting pits (7) are arranged on the lower portion of the arc-shaped groove in an arc shape, and limiting is performed respectively corresponding to the self-checking power supply position, the middle position and the three positions of the opening triangle of the voltage transformer of the seesaw type moving cutter arm; the lower part of the arc-shaped groove is provided with a rivet hole which is connected with a limit link rod (16) through a rivet; a ball limiting rod (17) is welded on the limiting link rod (15) corresponding to the ball limiting pit position (7), a spring is installed inside the ball limiting rod (17), balls are installed at the end part of the ball limiting rod, a limiting rod (16) is installed on the limiting link rod (15) corresponding to the arc-shaped groove position, one end of the limiting rod (16) is connected with the limiting link rod (15) through threads, a cap is arranged at the end part of the other end of the limiting rod, a section of neck with a reduced diameter is arranged behind the limiting link rod, the neck is clamped into the arc-shaped groove, and the length of the neck is matched with the balls; the upper part of the limiting link rod (15) is provided with a square hole, one end of a square transmission rod (22) is installed, an operating rod (20) is installed on the support plate (8) through a support plate fixing operating rod bolt (19), and the other end of the square transmission rod (22) is installed on the operating rod (20).

2. The manual self-checking switching device of the seesaw type as claimed in claim 1, wherein the both ends of the seesaw type moving arm are installed with insulating plates, the closed position light moving contact part (12) is installed on the insulating plates, the middle of the closed position light moving contact part (12) is an elongated copper plate, a pair of ears with bolt holes are arranged on the upper end of the elongated copper plate symmetrically, the ears are installed on the moving arm insulating plates by bolts, and the closed position light moving contact (11) is arranged below the ears corresponding to the closed position light fixed contact position; two ends of the wing-shaped linkage plate (30) are respectively connected with the strip-shaped copper plate through connecting rods.

3. The manual seesaw type self-checking switching device according to claim 1, wherein the square transmission rod (22) passes through a square hole in the middle of the 'wing-shaped' linkage plate (30) to realize transmission, two pin holes are formed in the front and rear of the square transmission rod (22), the outer side of the operation rod (20) is provided with a positioning pin (2) (21), the outer side of the limiting link rod (15) is provided with a positioning pin (1) (14), and the square transmission rod (22) is firmly installed through the positioning pin (1) (14) and the positioning pin (2) (21).

4. The manual seesaw type self-checking switching device according to claim 1, wherein the cable of the stationary contact (3) is led to the back of the insulating base (4) through the opening on the insulating base (4), and the cable connector is pressed by a wire clip through a bolt.

5. The manual seesaw type self-checking switching device according to any one of claims 1 to 4, wherein the manual seesaw type self-checking switching device has constituent elements mounted in a rectangular parallelepiped box, and the front and rear covers are detachable, and the box is mounted for use as a whole.

6. The manual seesaw type self-checking switching device according to claim 5, wherein the manual seesaw type self-checking switching device (32) is installed on the left portion of the rectangular box through the base, a fan-shaped hole is formed in the front cover corresponding to the position of the square transmission rod (22), the end portion of the square transmission rod (22) extends out of a portion of the front cover, the operation rod (20) is installed, and a supporting plate fixing operation rod bolt hole is formed in the lower portion of the operation rod (20) for fixing the operation rod; two sides of the upper part of the front cover are respectively provided with a round hole, and a self-checking power supply closed rear position lamp (37) and a voltage transformer open triangle closed rear position lamp (38) are respectively installed; the right part is provided with a voltage regulator (35), the upper part is provided with a round hole for mounting a voltage regulator voltage liquid crystal display (43), the middle part is provided with a round hole for mounting a voltage regulator adjusting knob (42), the lower part is provided with a rectangular hole for mounting a voltage regulator fuse (41), and the rear part is provided with a voltage regulator circuit board (40); the right position of the inner part of the box is provided with a wiring terminal block 1 (44), and the left position is provided with a round hole from which a cable is led out.

7. A high-voltage switch room grounding alarm comprises a manual 'seesaw' type self-checking switching device as claimed in any one of claims 1 to 6, and is characterized by further comprising an adjustable voltage relay (52), an audible and visual alarm (54), a test button (53), a single-phase air switch and a rectifier filter (56); the audible and visual alarm (54) and the single-phase air switch are both connected in series in an alternating current loop of the adjustable voltage relay (52), and the test button (53) is connected in parallel to a normally open contact of the adjustable voltage relay (52); the fixed point wiring of the seesaw is connected with the coil of the adjustable voltage relay (52) through a rectifier filter (56).

8. The high-voltage switch room grounding alarm device as claimed in claim 7, wherein the components of the high-voltage switch room grounding alarm device are arranged in a rectangular box, and the front cover and the rear cover of the rectangular box can be detached; the box is installed and used as a whole, the middle of the front cover is provided with a rectangular hole, the back of the rectangular hole is respectively welded with a screw rod up and down, and the upper screw rod and the lower screw rod are respectively connected through screws "

The shape pull rod fixes the adjustable voltage relay (52) through the rectangular hole and the two shape pull rods; a round hole is formed in the left side of a rectangular hole in the middle of the front cover, an audible and visual alarm (54) is installed, a round hole is formed in the right side of the rectangular hole, and a test button (53) is installed; the left side of the rear cover is provided with a rectangular hole, and a single-phase air switch is installed and can be operated from the outside; the rectifier filter (56) and the terminal block 2 (57) are arranged inside, a round hole is formed in the bottom of the right side of the rear cover, and a cable is led out from the round hole.

9. The high-voltage switch room grounding alarm device as claimed in claim 7, wherein the components of the high-voltage switch room grounding alarm device are installed in an instrument room (60) of the voltage transformer cabinet, the audible and visual alarm device (54) and the test button (53) are installed on the instrument room door, and the adjustable voltage relay (52), the single-phase air switch and the rectifier filter (56) are installed in the instrument room.