DE4410916A1 - Destructive arc damage limitation system for LV switching appts. - Google Patents

Abstract

The system has an arcing detector (20, 21), coupled to an electronic evaluation stage (18, 19), for supplying a fault signal to a signalling device (23), linked to an emergency service, e.g. an ionisation smoke detector fire alarm coupled to a fire station and linked to the evaluation stage by a radio signal. The arc detector may use light guides and/or Hall sensors, with the fault signal also used for operating an automatic extinguishing system installed in the LV switching appts.

Description

The invention relates to a method according to the preamble of Claim 1.

Arrangements and methods consisting of are known Arc detectors and at least one Evaluation electronics with switching devices and short-circuiters connected to by switching off or shorting one To extinguish the arcing fault.

Such arrangements and the implementation of these procedures not only requires considerable effort, but also lead also to interrupt supply for everyone Arc fault.

DE 30 17 144 C2 describes a device for reporting optical fire phenomena, especially sparks, known intended for use in a sawtooth suction device is. This device uses an optical fiber that the emitted light transmits. With a spark one becomes Extinguishing device controlled and simultaneously by a Alarm signaling functions triggered security functions. For example, the latter can be the shutdown of the machines Shutting down conveyor screws or controlling Fire dampers.

The object of the invention is therefore an alternative method to find according to the preamble of claim 1 cost-effective way of the fire consequences in the event of arcing faults diminishes.  

The object of the invention is characterized by the Features of claim 1 solved while in the subclaims particularly advantageous developments of the invention Marked are.

By applying the method you can easily Fire damage due to arcing can be reduced without that consumers are switched off in the event of false tripping.

It is particularly advantageous that by reducing the Fire insurance will make fire insurance cheaper.

It is particularly favorable if the signaling device is switched on Fire alarm or smoke alarm is there, which means no additional Setup is required.

Based on the drawing, in which an embodiment is shown is the invention, further refinements and Improvements of the invention and further advantages be described and explained.

It shows:

Fig. 1 shows a switchgear with a signaling device.

The low-voltage switchgear 1 shown in Fig. 1 consists of four fields 11 to 14 each having the functional compartments 15 to 17. To detect an arcing fault, the low-voltage system is provided with arcing fault detection devices in the first two fields 11 and 12 . The functional spaces of the system can have busbars, switching devices EA, KA, ER, or outgoing rails in a known manner.

The arcing fault detection devices each consist of detection electronics 18 , 19 and each of one or more arcing fault sensors 20 , 21 . The detection electronics 18 , 19 are connected to one another by a communication bus 21 .

The detection electronics 18 of the first arc fault detection device is connected to a fire detector 23 or smoke detector located on the ceiling of the room with a signal line 22 . The smoke detector can, for example, be a known ionization smoke detector in which, for. B. there is a voltage change in an ionization chamber.

The signal transmission to the fire alarm can be electrical, optically or wirelessly, e.g. B. by an infrared, radio transmitter or the like.

In the event of an internal arc, one or more internal arc sensors 20 , 21 activate the evaluation electronics, which give a signal to the fire alarm 23 .

The fire alarm alerts the associated fire brigade in a known manner Wise. In this way, the fire brigade can work much faster Fire site, so the extent of fire damage in easier Way is reduced.

False triggers advantageously do not lead to Switch off consumers connected to the switchgear are connected.

Claims (6)

1. A method for limiting damage to internal arcs in power distribution systems, especially in low-voltage switchgear, in which an internal arc detection device is used with at least one internal arc detector and electronic evaluation system, characterized in that the internal arc detection device passes an error signal to a signaling device that is connected to a security service. 2. The method according to claim 1, characterized in that the Notification device is connected to the fire department. 3. The method according to claim 1 or 2, characterized in that the detection device is a fire alarm ( 23 ) or smoke detector. 4. The method according to any one of the preceding claims that the message from the evaluation electronics to the device or fire alarm ( 23 ) is radio-controlled. 5. The method according to any one of the preceding claims that the Arc detectors made of optical fibers or Hall sensors or both. 6. The method according to any one of the preceding claims that a Extinguishing device is operated.