CN2469548Y

CN2469548Y - High-speed current-limiting protector for resistance variety

Info

Publication number: CN2469548Y
Application number: CN 01217923
Authority: CN
Inventors: 郭守恒
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-03-16
Filing date: 2001-03-16
Publication date: 2002-01-02
Anticipated expiration: 2011-03-16

Abstract

A fast resistance-varying current-limiting protective device is characterized in that a current passage is constructed with two series excitation magnets with micro resistance and opposite electromagnetic force directions. The two series excitation magnets touches with each other with push force and can split by moving in opposite directions. The two magnets are sleeved by the sliding way on a central axle with press springs arranged by the pressing way on the outer sides. The utility model not only can run in parallel connection with a reactor to reduce power consumption and guarantee the grid power supply quality; but also can be independently applied to an electrical system of 1KV or lower voltage to avoid the short-circuit current peaks and protect electrical appliances.

Description

Become the resistance current-limiting protection device fast

The utility model relates to overcurrent protective device, more particularly, is a kind of overcurrent protective device that is applied in the electric power system.

Along with the increase of electricity needs, net capacity constantly increases.And the short circuit current that causes because of short trouble in the system increases thereupon.For fear of the damage of electric heating, electric stress, have in the network select for use reactor to come fault current limiting to electric network elements such as transformer, cable, switches.As shown in Figure 3, reasonably select reactor L, though limiting short-circuit current effectively, (as load end D point place), and guarantee that K switch n reliably cut-offs, and reduces project cost; But, bring great energy consumption because reactor L is series in the circuit all the time.For the 2000A reactor is an example, move calculating in 330 days with the rated current per year, a year consumed power is about 280,000 KWh.Simultaneously, because sealing in of reactor reduced the power supply quality of electrical network.When starting as heavy load, reactor produces step-down etc.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, and a kind of quick change resistance current-limiting protection device is provided.With this device and reactor parallel running, to cut down the consumption of energy, to guarantee grid supply quality.

The purpose of this utility model is achieved through the following technical solutions:

Design feature of the present utility model by two inconsistent, can oppositely move the series excitation magnet that separates, have small resistance and constitute current channel, the electromagnetic force direction of two series excitation magnets is opposite.

Design feature of the present utility model is that also two series excitation magnets slide on the axis, and its outside has the stage clip pressure to establish.

The utility model is used for the reactor parallel running.During normal the operation, provide the operating current passage by the utility model, because the resistance of series excitation magnet is minimum, thereby power consumption seldom.In case the fault of being short-circuited, di/dt increases, and along with the increase of electric current, the mutual expelling force that produces between two magnets moves it to separate in opposite directions, and resistance increases, electric current then flow to the reactor passage.After this, by reactor performance metering function.Compared with the prior art, the utlity model has following advantage:

1, when the utility model and reactor parallel running, realized separating of reactance operation and defencive function.

2, when the utility model and reactor parallel running, greatly reduce load voltage drop on the reactor when starting, improved power supply quality.

3, the utility model also can be applied to separately can avoid peak value of short effectively in 1KV and the following low-voltage power system, electric equipment is played the effect of safeguard protection.

Fig. 1 is the utility model structural representation.

Fig. 2 is the utility model application circuit schematic diagram.

Fig. 3 is the prior art circuit theory diagrams.

By the following examples, in conjunction with the accompanying drawings the utility model is further described.

Embodiment:

Referring to accompanying drawing 1, present embodiment by two inconsistent, can oppositely move the series excitation magnet 1,2 that separates, have small resistance and constitute current channel, the electromagnetic force direction of two series excitation magnets 1,2 is opposite.

As shown in Figure 1, two the series excitation magnets 1,2 in the present embodiment slide on the axis 3, and its outside has stage clip 4 pressures to establish.

Referring to Fig. 2, the concrete application of present embodiment is protective device KX and the reactor L parallel running that is made of two series excitation magnets 1,2 above-mentioned.

During normal the operation, because the mechanical force of stage clip 4 keeps good contact between the magnet 1,2.Because magnet l, 2 is the good conductor of little resistance, thereby the operating current of this moment is a passage with the protective device KX that is made of magnet 1,2 only.When being short-circuited fault, fault current makes mutual expelling force between two magnets 1,2 greater than the mechanical external force of stage clip 4, and magnet 1,2 will move in opposite directions along axis 3 and separate, and resistance increases therebetween.Immediately, electric current is forced to flow to reactor L passage.By reactor L performance metering function, peak value of short reduces.Then, fault loop is cut-off, and it is done the loop and recovers normal operation.

In the current limliting process of above-mentioned reactor L, after avoiding and reducing peak value of short, magnet 1,2 can reset under the external force effect of stage clip 4.This device has utilized the hysteresis quality of mechanical action dexterously, when it reaches when resetting, has avoided the peak value of short circuit current.

In addition,, can reliably avoid peak value of short, can between two magnets 1,2, be arranged in parallel continued flow resistance in order to guarantee resetting of magnet corresponding to different systems.To increase the resistance in the magnet reseting procedure, time-delay reset.

In addition, the utility model also can be applied to separately in 1KV and the following low-voltage power system.

Claims

1, a kind of quick change resistance current-limiting protection device, it is characterized in that by two inconsistent, can oppositely move series excitation magnet (1,2) the formation current channel that separates, have small resistance, the electromagnetic force direction of two series excitation magnets (1,2) is opposite.

2, quick change resistance current-limiting protection device according to claim 1 is characterized in that described two series excitation magnets (1,2) slide on the axis (3), and its outside has stage clip (4) pressure to establish.

3, quick change resistance current-limiting protection device according to claim 1 is characterized in that being arranged in parallel continued flow resistance between described two magnets (1,2).