Patent GB-1163147-A (GB)
Title: Installation for Automatic Analysis of Electrical System Behaviour.
IPC: G06F19/00
Filed: 1966-11-11
Abstract: 1,163,147. Electronic calculaters. RUMANIA, MINISTRY OF ELECTRICAL ENERGY. 11 Nov., 1966 [12 Nov., 1965], No. 50728/66. Heading G4A. A visualizing and computing apparatus for carrying out the automatic analysis of the behaviour of an electric power supply system having plural generators and loads, according to the radial, equivalent, independent method of nodal image analysis set forth in detail in a quoted bibliography; and specifically carried out mechanically in Specification 868,815; comprises (Fig. 1) a digital computer 1 accepting data inserted manually at a by an operator, or derived directly over lines from a power system through an adapter 2; an external memory 4 containing a specific subprogram library for a variety of generator-load-network computations and a visualizing system 3 responsive to operator control at b for photography and registration, which displays against rectangular axes the resultant nodal image curve diagram of the operating conditions of a network of generating and loading nodes, under short circuit and stable operating conditions, for optimum performance of the system. The visualizing system comprises (Fig. 2) an auxiliary memory 5 storing the computed data of the short circuit currents in the node under analysis given by each generator of the network at distinct instants of time, registers 6, 7 into which the values of the abscissal and ordinal diagram co-ordinates for each generator connected to the respective node are transferred from the memory, digital/analogue converters 8 following the registers to feed integrators 9, and a display device 10 additively receiving the integrated outputs, for development of a nodal image. A local control console 11 controls the operation, and a registration device, e.g. a typewriter 12 and a photographic system 13 are provided for, e.g. an oscillograph display. The computed data stored in auxiliary memory 5 is relevant to the construction of the nodal image for the node under consideration at different instants of time, and registers 6, 7 receive binary abscissal and ordinal diagram components for each generator connected to the respective node. The binary representations of the abscissa and ordinate of a vector component are converted by D/A converters 8 to corresponding unidirectional voltages linearly varying in time to control the display. At fixed time intervals controlled from console 11, the vector components registered at 6, 7 are changed, and the slope of the vector is dependent on the ratio of the integrator input voltages while its length is dependent on the time interval, and is thus fixed; so that all vectors are represented on a common scale controllable from the console, which also controls a typewriter registering the R.E.I. components and, e.g., the short circuit currents, with the designations of the nodes understudy. Similarly, for oscillographic display, photographic apparatus is operable by the console 11, while the vectors may also be represented on a graphic analyser (not shown). A predetermined programme or a manual operator may initiate the transfer of R.E.I. data from the computer memory into the visualizing system, so that the image for any real or simulated node may be displayed automatically. Fig. 3 shows a nodal image for 6 generators supplying voltage and current to a common point; the contribution of each generator being shown by the relation of its vector current to the total short circuit current. Nodal images are given for dynamic variations over the duration of a short circuit (Fig. 4, not shown), for three generators feeding power into a single load with parasitic circulation (Fig. 5, not shown), and for the parasitic circulation itself (Fig. 6, not shown); and the immediate effects of variations of the characteristics of the systems may be inspected.