DE2048690A1 - Measuring arrangement for phase determination of live multi-wire systems at any point - Google Patents

Description

Measuring arrangement for phase determination of those under operating voltage Multi-wire systems at any point with measuring arrangement for phase determination of multi-conductor systems under operating voltage at any point Use of an alternating or pulse voltage source and a receiving device.

In the area of energy distribution, the problem arises, the phases of the energy supply network R, S and X far from the feed point, even under operating voltage to be able to determine with certainty.

A feed cable for house connection lines, to which, as is the case in many Cases where the individual houses are only connected with one phase can be strong Have load differences on the individual phases. Some should compensate for this Connections changed or another house should be connected. These Work will be done to disrupt the rest To avoid customers preferably carried out under tension. The structure of modern cables allows this Manipulation.

The determination of which wire can be connected to, or which Connections have to be re-clamped on the spot, i.e. in the individual Houses, or on the exposed and opened cable and under voltage.

Changes, additions and expansions are constantly being made in industrial companies the electrical distribution made.

Again, the determination of the respective phases must be carried out at any one The point of operation must also be possible when live, in order to make the work easier.

Malfunctions due to shutdowns in order to be able to measure are mostly unreasonable. These examples are just a few of the large number of Cases in which a phase determination under operating voltage at any point of the network must be carried out.

The previously known possibilities for a phase determination are insufficient. Either the distribution networks have to be switched off in order to be able to use direct current, Alternating current or pulse methods to be able to scan the phases, these methods disrupt the operation of the networks. Or there can also be audible tones of different heights be fed into the individual phases via appropriate security measures and these can be listened to on the spot. Overcoupling of a wire this can have a disruptive effect on the other. The effort is considerable.

The object of the invention is to provide a measuring arrangement for determining the phase in the case of multi-conductor systems under operating voltage at any point to create and the disadvantages of the known methods using a Weohsel voltage or pulse voltage source and a receiving device.

This object is achieved in that the alternating voltage or the Pulse sequence silver a known voltage-proof separating filter and a they in known switches with negligible switching time, which by means of a Clock is driven, periodically for a certain time at the first home and a clearly distinguishable longer or shorter period of time was assigned to the second phase is, whereby the measurement signals resulting from the switchover by means of an known receiver via a known voltage-proof separation filter to determine the phases can be queried at any point in the system and the third phase that is not fed in as a result of the existing in multi-conductor systems the same capacitance of the conductors with each other, both Hess signals have the same amplitude picks up, i.e. carries a continuous signal and is thus also clearly recognizable.

The puncture d dev ^ * zaordnung is in an exemplary embodiment explained with reference to the drawings.

In Fig. 1 a section of a multi-conductor system is shown, the the phases R, S and 1 and the return conductor O.

An alternating voltage or pulse generator 1 feeds via a voltage-proof Drenn filter 2 and a switch 4 switched by the clock generator 3 periodically alternating, z.3. phases R and S.

At the house connection 12, the phase of which is to be determined, the receiver 5 via a voltage-proof separating filter 6 to the always known neutral conductor 0 and the unknown phase (?) connected.

On the instrument of the receiver 7 and when using audible alternating spalming or pulse frequencies also in the headphones or loudspeaker 8 can now be fed in Phase R identifier can be observed or heard according to Fig. 2a. The instrument swings periodically from a rest position to the left.

There is a short tone with a long interruption in the headphones or loudspeaker to listen. In house connection 9 with the same connection of the reception device the phase S according to Fig. 2b can be determined. The instrument strikes from a rest position periodically to the right. There is a long lasting in the headphones or speakers Sound can be heard with short interruptions while at the house connection lo when switched on the receiving device, the continuous signal according to Fig. 2c as an identifier for phase T can be determined is. The instrument shows a constant load without interruption. In the headphones or loudspeaker a continuous tone can be heard.

At the house connection 11 can by applying the receiving device to the individual phases these are assigned one after the other in the aforementioned manner. The separating filter between alternating voltage or pulse voltage source and switch 2 is not necessary if the switching of these sources is set up in such a way that that without a special filter, the mains voltage applied to the cable would not be the source can destroy and the source can transfer its voltage to the cable undisturbed.

The following circuit, for example, can be used: One tuned to 12 kHz Series resonant circuit is connected to the mains in series with a thyristor and controlled via an auxiliary circuit in such a way that the thyristor is activated with every positive change the mains voltage is ignited and the switching surge in the resonant circuit is a decaying one 12 kHz oscillation is generated as it is periodically fed into the cable network.

When using the arrangement on high-voltage networks, however, is always a special separation filter may be necessary.

When using the arrangement on networks with particularly low voltage, E.g. 24 volt alternating voltage, does not necessarily need that on the receiver side Separation filter 6 to be present if the receiver input circuit allows it, since this voltage does not endanger the person measuring.

Claims (4)

Claims Measuring arrangement for phase determination when the operating voltage is below standing multi-conductor systems at any point using an interchangeable or pulse voltage source and a receiving device, characterized in that that the alternating voltage or the pulse sequence has a voltage-resistant one that is known per se Separation filter and a switch known per se with negligible switching time, which is driven by means of a clock, periodically for a certain time to the first phase and a clearly distinguishable longer or shorter time to the second Phase is placed, with the measurement signals resulting from the switching by means of of the receiver known per se via a voltage-proof separating filter known per se to determine the phases can be queried at any point in the system and the third phase not fed in as a result of the existing in multi-conductor systems the same capacitance of the conductors, both measurement signals have the same amplitude picks up, so carries a continuous signal, and is thus also clearly recognizable. 2. Measuring arrangement according to claim 1, characterized in that at voltage-resistant training of the alternating or impulse voltage source the voltage-resistant Separation filter (2) is not required. 3. Measuring arrangement according to claim 1 and 2, characterized in that If the mains voltage is not dangerous, the voltage-proof separating filter (6) on the receiver not applicable. 4. Measuring arrangement according to claim 1, 2 and 3, characterized in that that as a pulse voltage source a periodic sequence of decaying oscillations is usable.