CN207612057U - A kind of novel fault current limiter - Google Patents

Abstract

The utility model proposes a kind of novel fault current limiters, including a three winding series transformer and three switches.The both ends series connection line attachment and the first side winding both ends connection first switch of the first side of series transformer winding, in addition winding both ends in both sides are separately connected second switch and third switchs.The utility model device limits the short circuit current of system by the leakage reactance of series transformer by the switching quickly to the connection of series transformer difference winding, and the drop-out current of switch is small, voltage class is low, improves the reliability of failure current limit equipment.

Description

A kind of novel fault current limiter

Technical field

The utility model is related to a kind of novel fault current limiters.

Background technology

With the expansion of power system capacity and scale, the level of short-circuit fault of power system electric current is also continuously improved, short Road failure is also increasing to the destructiveness of electric system and coupled electrical equipment.Fault current limiter is detecting short circuit After failure occurs, by quickly changing the impedance parameter of faulty line, short circuit current is limited in low-level, to protect electric power to set It is standby, meet existing breaker and cuts off short trouble under the premise of no more than its breaking capacity.

Current published fault current limiter has resonant mode fault current limiter, solid-state fault current limiter and super-conductive fault current limliting Device etc. is direct-on-line road installation current limiter, exits the bypass of the equipment of current limliting in system normal operation, in system Current limiter is put into when failure.It is substantially high-voltage system to need the AC system of current limliting in failure at present, and current limliting is set For when being directly installed on certain circuit of high-voltage system, the fault current that current limiter is born is larger, current limiter phase The section breaker or device answered electric current in disjunction are also larger, affect the reliability of equipment, need a kind of safer, reliable Failure current limit equipment.

Utility model content

The purpose of this utility model is to provide a kind of reliability height and the novel fault current limliting suitable for engineer application The solution of equipment, the utility model is：

A kind of novel fault current limiter is provided,

The failure current limit equipment includes three winding series transformer and three switches；The three winding series transformer First side winding both ends series connection line attachment, the first side winding of the series transformer are connected in parallel with first switch；It is described Series transformer the second side winding and third side winding are connect with second switch and third switch in parallel respectively.

Further, above three switch is mechanical switch or the switch being made of power electronic equipment.

Further, at least one switch and a reactor during the second switch of above-mentioned series transformer and third switch It is connected in parallel.

Further, above-mentioned reactor is connected in parallel with capacitor.

Further, the both ends of at least side winding of above-mentioned series transformer at least one overvoltage protection in parallel is set It is standby.

Further, above-mentioned overvoltage protective device includes arrester and spark gap.

Correspondingly, the above-mentioned corresponding control method of failure current limit equipment is, when AC system normal operation, first switch is disconnected It opens, second switch closes a floodgate, and third switch disconnects；After judging that catastrophe failure occurs for circuit or circuit proximal end, third is first closed Switch disconnects second switch again.

Alternatively, the above-mentioned corresponding control method of failure current limit equipment is, when AC system normal operation, first switch is disconnected It opens, second switch closes a floodgate, and third switch closes a floodgate；After judging that catastrophe failure occurs for circuit or circuit proximal end, disconnects second and open Close or disconnect third switch.

After adopting the above scheme, the utility model can be held to avoid failure current limit equipment mounted on voltage levels system The high voltage and high current received improve the reliability and economy of failure current limit equipment；This programme utilizes series transformer not With the different leakage reactance access systems between winding, in steady-state operation, with smaller leakage reactance line attachment, reduce to system load flow It influences, is serially accessed to the circuit with larger leakage reactance in failure, the short circuit current of suppression system.

Description of the drawings

Fig. 1 is the novel fault current limiter of the utility model one embodiment；

Fig. 2 is the novel fault current limiter of second embodiment of the utility model；

Fig. 3 is the novel fault current limiter of the utility model third embodiment；

Fig. 4 is the novel fault current limiter of the 4th embodiment of the utility model；

Wherein：1- three winding series transformers, 2- first switches, 3- second switches, 4- thirds switch, 5- reactors, 6- Capacitor, 7- reactors, 8- capacitors.

Specific implementation mode

Specific embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.

The utility model proposes a kind of novel fault current limiters, and preferably embodiment is as shown in Figure 1 for one.The event It includes a three winding series transformer 1, first switch 2, second switch 3 and third switch 4 to hinder current limiter；

The first side winding both ends series connection line attachment of series transformer 1, the first side winding of series transformer 1 and first Switch 2 is connected in parallel；The second side winding of series transformer 1 and third side winding both ends are opened with second switch 3 and third respectively 4 are closed to be connected in parallel；First switch 2, second switch 3 and third switch 4 are mechanical switch or are made of power electronic equipment Switch.

The utility model proposes a kind of novel fault current limiter second preferred embodiment as shown in Fig. 2, second Switch 3 is connected in parallel with a reactor 5.

The utility model proposes a kind of novel fault current limiter third preferred embodiment as shown in figure 3, second Switch 3 is connected in parallel with a reactor 5, and second switch 3 is connected in parallel with a capacitor 6.

The utility model proposes a kind of novel fault current limiter the 4th preferred embodiment as shown in figure 4, second Switch 3 is connected in parallel with a reactor 5, and second switch 3 is connected in parallel with a capacitor 6；Third switch 4 with One reactor 7 is connected in parallel, and third switch 4 is connected in parallel with a capacitor 8.

The corresponding control method of above-mentioned 4 kinds of novel faults current limiter scheme is, when AC system normal operation, first opens It closes 2 to disconnect, second switch 3 closes a floodgate, and third switch 4 disconnects；After judging that catastrophe failure occurs for circuit or circuit proximal end, first close Upper third switch 4 disconnects second switch 3 again；In failure current limit equipment fault or maintenance, first switch 2 is closed.

Alternatively, the corresponding control method of above-mentioned 4 kinds of novel fault current limiters is, when AC system normal operation, first Switch 2 disconnects, and second switch 3 closes a floodgate, third switch 4 closes a floodgate；After judging that catastrophe failure occurs for circuit or circuit proximal end, break It opens second switch 3 or disconnects third switch 4；In failure current limit equipment fault or maintenance, first switch 2 is closed.

It should be noted that each element in the utility model, such as reactor, capacitance, switch, refer to equivalent member mostly Part；That is, equivalence element in circuit structure is either single element, can also be multiple same elements cascades (series, parallel etc.) forms.For any equivalence element in the utility model embodiment, any of said function can be realized Equivalent circuit should all be covered within the protection domain of the utility model embodiment.

Finally it should be noted that：Only illustrate the technical solution of the utility model in conjunction with above-described embodiment rather than it is limited System.Those of ordinary skills in the art should understand that：Those skilled in the art can be to the specific implementation of the utility model Mode is modified or replaced equivalently, but these modifications or change are being applied within pending patent requirements protection domain.

Claims (6)

1. a kind of novel fault current limiter, it is characterised in that：

The failure current limit equipment includes three winding series transformer and three switches；The first of the three winding series transformer Side winding both ends series connection line attachment, the first side winding of the series transformer are connected in parallel with first switch；The series connection Transformer the second side winding and third side winding are connect with second switch and third switch in parallel respectively.

2. a kind of novel fault current limiter as described in claim 1, it is characterised in that：

The switch that three switches are mechanical switch or are made of power electronic equipment.

3. a kind of novel fault current limiter as described in claim 1, it is characterised in that：

At least one switch is connected in parallel with a reactor in second switch and the third switch of the series transformer.

4. a kind of novel fault current limiter as claimed in claim 3, it is characterised in that：

The reactor is connected in parallel with capacitor.

5. a kind of novel fault current limiter as described in claim 1, it is characterised in that：

The both ends of at least side winding of the series transformer at least one overvoltage protective device in parallel.

6. a kind of novel fault current limiter as claimed in claim 5, it is characterised in that：

The overvoltage protective device includes arrester and spark gap.