SU976405A1 - Device for checking distributed electric network insulation resistance - Google Patents

Description

(5) RESISTANCE CONTROL DEVICE

ISOLATION BRANCHED ELECTRIC

one

This invention relates to electrical measuring technology and can be used to control the insulation resistance of an extensive electrical network containing several sources of electrical energy.

A device is known for monitoring the insulation resistance of an electrical power system, comprising two generators, two main switchboards and an insulation resistance control unit connected through a switch to either the first or second switchboard 1,

The drawback of the device is the impossibility of continuously monitoring the insulation resistance during the operation of each generator on its switchboard,

The closest to the technical essence of the invention is a device for controlling the resistance of iso-NET

This module contains two generators, two main switchboards and two insulation resistance monitoring units each connected to its own distribution Tsigu 2,

A disadvantage of the known device is the low measurement accuracy of the insulation resistance with simultaneous operation of both insulation resistance monitoring units, due to the fact that the distribution of currents in the measured circuits is inversely proportional to the internal resistances of the auxiliary sources, namely, the 5 research institutes of the monitoring units.

The aim of the invention is to improve the accuracy of measuring

Claims (1)

The goal is achieved by the fact that an insulation resistance control device of a branched electrical network containing two generators, a switch and two insulation resistance control units, whose inputs are connected to the corresponding switchboards and the output of one of them is connected to the earthing switch switching unit, an alarm unit and an additional resistor, the output of the second control unit, the insulation resistance is connected via the switching unit to the grounding directly, or through an additional resistor, and the switch contacts are connected to the inputs of the switching and signaling blocks. The drawing shows a block diagram of the device. The device contains sources 1 and 2 of energy (generators) connected through automatic switches 3 and 4 with switchboards 5 and 6, which are connected to each other by switch 7, the first and the second block 8 and 9 of the insulation resistance monitoring unit, the switching unit 1Q, an additional resistor 11, the alarm unit 12 The device operates as follows. When separate sections of the network, the switch 7 is open, the insulation resistance monitoring unit 8 controls the insulation state of the network section, source 1 is switchboard 5, and the 1P switching unit connects the output of the insulation resistance control unit 9 to the ground directly. The control of the network section of the source 2 - switchboard 6 "The alarm unit 12 in this mode is switched off by the switch 7 c. When parallel sections of the network, the switch 7 is open; the switching unit 1 connects the output of the insulation resistance control unit 9 to earth via an additional resistor 11, and the insulation resistance monitoring unit 9 works as a single-phase earth fault indicator (object body) in the source 1 network - switchboards 5 and 6 - source 2 The alarm unit 12, on command from the switch 7, signals this mode of operation of the block 9, the insulation resistance value being monitored, the network is estimated by the indicators of the insulation resistance monitoring unit 8. isolation control device of extensive networks reduces the methodological error in operating modes with simultaneous switching on of several control devices and ensures proper functioning of all insulation resistance control devices in case of separate sections of the network. Invention control device for isolation of branched electrical network containing two generator, a switch and two insulation resistance control units, whose inputs are connected to the corresponding distribution boards, and the output of one of them is to the grounding conductor, as it is. so that, in order to improve the measurement accuracy, a switching unit, an alarm unit and an additional resistor are inserted into it, the output of the second insulation resistance monitoring unit is connected via the switching unit to the earthing switch directly or via an additional resistor, and to the switch contacts are connected switching and signaling units. Sources of information taken into account in the examination of 1, Nikiforovsky H „H. and others „Ship power plants. M., Transport, 197, p. 380. 2, Mikhailov V.A. Automated power systems of ships. L., Shipbuilding, 1977, p. 395 (prototype).