CN201741647U

CN201741647U - Air switch with delay tripping and automatic superposition functions

Info

Publication number: CN201741647U
Application number: CN2010202323033U
Authority: CN
Inventors: 李欣; 李柏林; 李博琛; 熊鲁红
Original assignee: XIAMEN TAIHANG TECHNOLOGY Co Ltd
Current assignee: XIAMEN TAIHANG TECHNOLOGY Co Ltd
Priority date: 2010-06-10
Filing date: 2010-06-10
Publication date: 2011-02-09
Anticipated expiration: 2020-06-10

Abstract

The utility model relates to an air switch with delay tripping and automatic superposition functions, which comprises an air switch shell body, a switch wrench, an incoming end, an outgoing end, a current sensor, an electronic control mechanism and an arc extinguishing mechanism, and is characterized in that the incoming end is provided with a static contact; a moving contact which can be connected with and separated from the static contact; one end of the moving contact is connected with a tripping mechanism and the other end of the moving contact is connected with a coil of an electromagnet; the electromagnet is connected with the outgoing end; an L-shaped buffer displacement shrapnel is arranged right in front of a mandril of the electromagnet; the other end of the buffer displacement shrapnel is connected with a buffer device; and the buffer device is connected with the tripping mechanism. When lightning impulse current occurs, the mandril of the electromagnet is propped up and is quickly reset, the shrapnel of the buffer mechanism is pushed and immediately loses displacement pushing force, the buffer device does not displace, the shrapnel of the buffer mechanism is reset, the tripping mechanism maintains the original state, and the purposes that short-circuit current is quickly tripped and the lightning impulse current is not tripped are achieved.

Description

A kind of air switch that has delayed releasing and overlap function automatically

Technical field

The utility model relates to a kind of air switch, and particularly a kind of the series connection with anti-lightening protector used, lightning current by the time have a delayed releasing and overlap the air switch of function automatically.

Background technology

The existing anti-lightening protector that is applied in power-supply system, inner core devices mainly is a Zinc-oxide piezoresistor.Anti-lightening protector in the bleed off lightning current, is also bearing the threat of electrical network temporary overvoltage on power line.Power-supply system generation temporary overvoltage is at random, and the temporary overvoltage time is long, and the electric current that flows into resistive element produces high temperature rise at the weak spot place and melts the formation short dot, and power supply continues to promote a bigger electric current and pours into short dot.The short dot of burn through outwards sprays the flame of high temperature, and the gas of this moment is that the great pressure of formation fires because moment remains in limited the space in, causes the fire incident generation, distribution system is caused have a strong impact on.

For safety, relevant criterion (GB50057-19942000 version) regulation, lightning protection device must be installed in series fuse or miniature circuit breaker (being commonly called as air switch), the lightning protection device that is used for causing when power supply generation temporary overvoltage plays the deenergization effect when taking place to burn.And during lightning protection device generation burn through short trouble, short dot is just little from transformer distance, the big short circuit current of earth resistance, otherwise then big.In actual applications, the infield of most lightning protection devices exists during the lightning protection device short circuit resistance, short circuit current to be not enough to promote normal air switch moment in addition and threads off not at transformer not nearby, causes the lightning protection device catching fire.In addition when lightning current passes through lightning protection device; the current path of normal air switch is not a linear; the electric power that produces makes the air switch false tripping; cause power-supply system to lose lightning protection, this specific character does not meet the characteristics that lightning protection device is not threaded off at the rapid dropout of little short circuit current (usually less than 150A), impulse current (usually greater than 40kA).

The utility model content

The purpose of this utility model is that a kind of air switch that has delayed releasing and overlap function automatically will be provided, and it has linear current channel, can thread off rapidly when short circuit current reaches 100A; And when lightning current surpasses 40kA, have delayed releasing and overlap function automatically, promptly when threading off, can detect the air switch that lightning protection device returns to form and can overlap automatically automatically.

The utility model is to realize like this, described a kind of air switch that has delayed releasing and overlap function automatically, it comprises air switch housing, switch knob, end of incoming cables, leading-out terminal, gear box, switch belt pulley, gear box main pulley, current sensor, electronic control mechanism, arc-extinguishing mechanism, it is characterized in that: be provided with a fixed contact in the end of incoming cables; Have one can with the moving contact of fixed contact deciliter, an end of moving contact is connected with tripping mechanism, the other end of moving contact is connected with magnet spool, electromagnet is connected with leading-out terminal; The dead ahead of the push rod of electromagnet is provided with one " L " shape buffer displacement shell fragment, and the other end of buffer displacement shell fragment is connected with buffer unit, and buffer unit is connected with tripping mechanism.

Buffer unit described in the utility model is flying wheel or weight or damping gear or air valve or delay circuit; Driving-belt on the described gear box is steel band or nylon tape; Current detection circuit and fixed contact and moving contact are connected in parallel; All devices are integrated in the air switch of a standard 18mm width.

When lightning protection device was short-circuited fault current, a built-in electromagnet of the utility model moved rapidly, and Zinc-oxide piezoresistor short-circuit current time constant is at Millisecond, and lightning impulse current is in the microsecond level.By the time difference of these two kinds of electric currents, the time length according to electromagnet push rod motion is subjected to displacement reaches the purpose that short circuit current is threaded off rapidly, lightning impulse current is not threaded off.

The beneficial effects of the utility model are, when short circuit current took place, the electromagnet push rod ejected rapidly, promote the buffer gear shell fragment, because the continuing of short circuit current, the shell fragment displacement drives buffer unit and is delivered to tripping mechanism, the contact deenergization after through a time t.When lightning impulse current takes place, the electromagnet push rod returns to original position again rapidly after ejecting, after the buffer gear shell fragment is pushed, lost the displacement motive force at once again, buffer unit also is not subjected to displacement, the buffer gear shell fragment has recovered original position again, and tripping mechanism maintains the original state, and has reached the order ground that short circuit current is threaded off rapidly, lightning impulse current is not threaded off; When thread off taking place, electronic circuit of the present utility model detects lightning protection device automatically and returns to form, and when the electric current that flows through is little during to the microampere rank, closes again automatically, keeps lightning protection device to be in the state that is connected power circuit.

Description of drawings

Fig. 1 is the utility model schematic appearance.

Fig. 2-1 is a front view of the present utility model.

Fig. 2-2 is a left view of the present utility model.

Fig. 2-3 is a right view of the present utility model.

Fig. 2-4 is a vertical view of the present utility model.

Fig. 3-1, Fig. 3-2 is disconnection described in the utility model (dropout) view.

Fig. 4-1, Fig. 4-2 is combined floodgate described in the utility model (buckling) view.

Fig. 5-1, Fig. 5-2 is current path view described in the utility model.

Fig. 6-1, Fig. 6-2 ejects view for lightning impulse current described in the utility model causes the electromagnet push rod.

Fig. 7 is the utility model electrical schematic diagram.

Among the figure: 1. housing, 2. leading-out terminal, 3. buffer displacement shell fragment, 4. switch knob, 5. switch belt pulley, 6. tripping mechanism, 7. gear box main pulley, 8. fixed contact, 9. end of incoming cables, 10. current sensor, 11. power supplys, 12. moving contacts, 13. arc-extinguishing mechanism, 14. gear boxes, 15. buffer units (flying wheel), 16. electronic control mechanism, 17. card rails, 18. electromagnet.

Embodiment

A kind of air switch that has delayed releasing and overlap function automatically described in the utility model, as Fig. 1, Fig. 2-1, Fig. 2-2, Fig. 2-3, Fig. 2-4, Fig. 3-1, Fig. 3-2, Fig. 4-1, Fig. 4-2, Fig. 5-1, Fig. 5-2, Fig. 6-1, Fig. 6-2, shown in Figure 7, it comprises air switch housing 1, switch knob 4, end of incoming cables 9, leading-out terminal 2, gear box 14, switch belt pulley 5, gear box main pulley 7, current sensor 10, electronic control mechanism 16, arc-

extinguishing mechanism

13, and 9 are provided with a fixed contact 8 in the end of incoming cables; Have one can with the moving contact 12 of fixed contact 8 deciliters, an end of moving contact 12 is connected with tripping mechanism 6, the other end of moving contact 12 is connected with the coil of electromagnet 18, electromagnet 18 is connected with leading-out terminal 2; The dead ahead of the push rod of electromagnet 18 is provided with one " L " shape buffer displacement shell fragment 3, and the other end of buffer displacement shell fragment 3 is connected with buffer unit (flying wheel) 15, and buffer unit (flying wheel) 15 is connected with tripping mechanism 6.Also be provided with card rail 17 among Fig. 4-1, Fig. 4-2.

Buffer unit described in the utility model is flying wheel or weight or damping gear or air valve or delay circuit; Driving-belt on the described gear box 14 is steel band or nylon tape; Current detection circuit and fixed contact and moving contact are connected in parallel.

Power line inserts in the end of incoming cables 9 among Fig. 5-1, Fig. 5-2, and electric current arrives moving contact 12 through fixed contact 8, arrives leading-out terminal 2 through electromagnet 18, has kept the linear pattern current channel.

Fig. 6-1, among Fig. 6-2 when lightning protection device is short-circuited fault, short circuit current impels electromagnet 18 push rods to eject rapidly, push down buffer displacement shell fragment 3, buffer displacement shell fragment 3 moves to Fig. 6-1, position shown in Fig. 6-2, buffer unit (flying wheel) 15 is because effect of inertia can not be followed 3 rotations of buffer displacement shell fragment synchronously, this moment, short circuit current did not disappear, electromagnet 2 push rods still are pressed on the buffer displacement shell fragment 3, behind time-delay millisecond time Δ t, buffer unit (flying wheel) 15 drives tripping mechanism 5 rapidly and opens moving contact 12, the electric arc that the disjunction short circuit current produces extinguishes in arc-extinguishing mechanism 13, and power supply is cut off.

And when lightning impulse current takes place, after electromagnet 18 push rods ejected and push down buffer displacement shell fragment 3, impulse current finished rapidly, electromagnet 18 push rod returns, buffer unit (flying wheel) 15 has reached the order ground that lightning impulse current is not threaded off because effect of inertia still keeps motionless state.

Fig. 7 is the utility model electrical schematic diagram, and SB is a switch knob 4, and DZ is an electromagnet 18, and CT is a current sensor 10, and S1 is end of incoming cables 9, and S2 is a leading-out terminal 2, and AC/DC is a power supply 11, and CK is a gear box 14, and M is the CD-ROM drive motor of gear box, and MCU is a circuit control system.

When switch knob SB closes; power supply L is switched on and arrives anti-lightening protector P1; when lightning protection device is short-circuited fault when the utility model is threaded off; CT begins to detect lightning protection device by the leakage current state; when leakage current returns to acceptable ranges; MCU sends the high level instruction that closes a switch; high level arrives the control electrode of triode GB by resistance R; GB conducting motor M begins to rotate, and gear box makes the switch knob rotation by conveyer belt, after switch knob closes a floodgate successfully; current sensor CT is because of by contact loop short circuit current vanishes; close a floodgate successfully, MCU finishes this control, waits for periodic duty next time.

In this circuit, AC/DC provides working power to circuit, and diode D is used for protection control triode, and capacitor C is to be used for filtering.

Claims

1. one kind has delayed releasing and the automatic air switch that overlaps function, it comprises air switch housing, switch knob, end of incoming cables, leading-out terminal, gear box, switch belt pulley, gear box main pulley, current sensor, electronic control mechanism, arc-extinguishing mechanism, it is characterized in that: be provided with a fixed contact in the end of incoming cables; Have one can with the moving contact of fixed contact deciliter, an end of moving contact is connected with tripping mechanism, the other end of moving contact is connected with magnet spool, electromagnet is connected with leading-out terminal; The dead ahead of the push rod of electromagnet is provided with one " L " shape buffer displacement shell fragment, and the other end of buffer displacement shell fragment is connected with buffer unit, and buffer unit is connected with tripping mechanism.

2. according to the described a kind of air switch that has delayed releasing and overlap function automatically of claim 1, it is characterized in that: described buffer unit is flying wheel or weight or damping gear or air valve or delay circuit.

3. according to the described a kind of air switch that has delayed releasing and overlap function automatically of claim 1, it is characterized in that: the driving-belt on the described gear box is steel band or nylon tape.

4. according to the described a kind of air switch that has delayed releasing and overlap function automatically of claim 1, it is characterized in that: current detection circuit and fixed contact and moving contact are connected in parallel.

5. according to the described a kind of air switch that has delayed releasing and overlap function automatically of claim 1, it is characterized in that: all devices are integrated in the air switch of a standard 18mm width.