CN2116954U

CN2116954U - Transfomer with lightning arrester

Info

Publication number: CN2116954U
Application number: CN 91215981
Authority: CN
Inventors: 忻兵; 贾法谦; 薄瑞臣; 徐宁; 黄询石
Original assignee: SHANGHAI RAILWAY COLLEGE
Current assignee: Signal Equipment Factory,Shanghai Railway College
Priority date: 1991-10-09
Filing date: 1991-10-09
Publication date: 1992-09-23

Abstract

The utility model discloses a transformer with a lightning arrester, which realizes the lightning protection of signal equipment through the coupled time delay between a primary coil and a secondary coil. The utility model is characterized in that the primary coil and the secondary coil are respectively wound around two iron core columns on which frameworks are respectively arranged; the primary coil and the secondary coil are respectively wound around the framework; each layer of coil is provided with packing paper, and inner insulating layer, an outer insulating layer, and shielding layers are respectively arranged outside the coils; each shielding layer is electrically connected with the iron core columns and then connected with the earth ground. The utility model has a high voltage resisting performance, and has no special requirement for the ground resistance of the ground wire, and the utility model is a transformer with lightning arrester which can change the present lightning protection method by discharging the lightning current.

Description

Transfomer with lightning arrester

The utility model relates to telecommunications, computer system, is particularly useful for the railway signal technology field, is the protection when finishing the signalling arrangement thunderbolt by magnetic-coupled time-delay between the primary and secondary coil of transformer and raising withstand voltage properties specifically.

At present unimpeded for guaranteeing railway transportation, at first require the intact of railway signal condition of work, and the influence that signalling arrangement is struck by lightning is very serious, directly influences the normal use of signalling arrangement in the utilization process.Very years of researches were once carried out to the signalling arrangement lightning protection in the railway signal technology field, a whole set of lightning Protection way is proposed, as adopt the lightning protection components and parts lightning current of releasing to come guard signal equipment, but because the quality problems of lightning protection components and parts, often poor effect does not have the lightning protection effect, and is as far as possible little to the ground wire earth resistance simultaneously, otherwise fragile equipment, and to obtain difficulty of low-resistance ground wire in actual the use.Be subjected to reasons such as thunderbolt and automatic aging in addition owing to the lightning protection components and parts, need generally test and change every year, workload is big extremely inconvenient.

The purpose of this utility model provides need not consider high-quality lightning protection components and parts, and the withstand voltage properties height, earth resistance does not have specific (special) requirements, and changes a kind of lightning protection transformer of the Lightning Protection of the present lightning current of releasing.

For finishing the above-mentioned technical scheme that purpose adopted, the primary and secondary coil that changes original transformer closely is wound on the iron core column as shown in Figure 1.Primary and secondary coil of the present utility model is to be wound on respectively on two iron core column, two iron core column are established skeleton respectively, the coil of primary and secondary is wound on respectively on the thermoplastic engineering plastic PBT.G30 skeleton, establish packing paper in the middle of the lattice coil, the coil outside is provided with the screen of inside and outside insulating barrier, polytetrafluoroethylene film respectively, and each screen and iron core column are electrically connected and ground connection.

The utility model embodiment is described in detail in conjunction with the accompanying drawings.

Fig. 1 is the primary and secondary coil winding schematic diagram of former transformer;

Fig. 2 is the primary and secondary coil winding schematic diagram of the utility model;

Fig. 3 is the utility model profile.

According to Fig. 2 and shown in Figure 3, both sides iron core column 1 and 2 is established skeleton 7 respectively, primary and secondary coil 3 is wound on respectively on the thermoplastic engineering plastic PBTG30 skeleton 7, establish packing paper 4 in the middle of every layer line circle 3, coil 3 outsides are provided with the screen 6 of inside and outside insulating barrier 5, polytetrafluoroethylene film respectively, and each screen 6 is electrically connected and ground connection with iron core column.

Primary and secondary coil of the present utility model is wound on respectively that purpose is that the magnetic coupling of 3 of primary and secondary coils is delayed time on two iron core column 1 and 2, when elementary coil connection signal, set up magnetic field behind time coil generation induced electricity, one section time-delay must be arranged, because time constant

=(L)/(R) inductance value of transformer is big more, and it is long more to set up the magnetic field required time, and before whole iron circuit was set up fully, secondary coil can not produce enough induced voltages.Magnetic-coupled time-delay also is directly proportional with signal frequency, the time-delay of common 50Hz signal frequency secondary coil induced voltage is a few tens of milliseconds approximately, and the time of lightning waveform is between 1.5/50 μ s～10/200 μ s～10/700 μ s, therefore, the time-delay that the primary and secondary coil of the utility model is 3 is greater than the duration of thunderbolt voltage, and when the utility model suffered high frequency spike thunderbolt, secondary coil must and not set up induced voltage as yet, thunderbolt finishes, has played the lightning protection effect.

Shown in Figure 3 according to the utility model section, for the high frequency that solves lightning strike signals is harassed influence, adopt in the polytetrafluoroethylene film composition, outer shielding layer 6, each screen 6 is electrically connected with iron core and ground, improved the withstand voltage of transformer, the earth resistance of this earth connection there is no specific (special) requirements simultaneously for improving withstand voltage properties of the present utility model, and skeleton 7 adopts thermoplastic engineering plastic PBTG30 to constitute.

The utility model except that electric property satisfies the requirement of the various different models of railway signals equipment,

The main lightning protection purpose that reaches, the isolation that can be widely used in signalling arrangement and outside line or locate with rail etc. all can be played the lightning protection effect well.

Claims

1, a kind of lightning protection transformer of forming by iron core column, coil, skeleton, it is characterized in that both sides iron core column 1 and 2 establishes skeleton 7 respectively, primary coil 3 is wound on respectively on the thermoplastic engineering plastic PBTG30 skeleton 7, packing paper 4 in the middle of every layer line circle 3, in coil 3 outsides are provided with respectively, the screen 6 of external insulation layer 5, poly-fluorine ethylene film, each screen 6 is electrically connected and ground connection with iron core column.