RU149317U1 - UNIT OF RESISTANCE RESISTANCE AND AVAILABILITY OF VOLTAGE OF BKIN-A OF THE BASIC CABINET OF THE UNIFIED COMPLEX OF TECHNICAL MEANS - Google Patents

Abstract

The control unit for insulation resistance and the presence of voltage in the base cabinet of a unified set of hardware and software for automating the control of technological equipment of a power plant, characterized in that it contains a microcontroller with hard programming and also contacts for connecting the unit to power circuits and terminal blocks.

Description

The field of technology.

The utility model relates to the field of energy, electrical engineering and automation and can be used to build automated control systems and technological processes of power plants.

State of the art

Currently, the well-known cabinets of the unified complex of hardware and software tools (UKTS) as a whole are used to place remote control units, to form technological protection teams; signaling, analog-discrete signal conversion, logical signal conversion, time delays, voltage conversion, providing in-cabinet connections between blocks and cross terminal blocks.

In this case, the blocks for monitoring the insulation resistance and the presence of voltage are installed in these cabinets.

The UKTS-M cabinet as a whole serves for placement of remote control units, formation of technological protection teams; signaling, analog-discrete signal conversion, logical signal conversion, time delays, voltage conversion, providing in-cabinet connections between blocks and cross terminal blocks.

UKTS performs the functions of controlling technological parameters and controlling equipment of technological systems in accordance with the algorithms specified in UKTS.

In emergency conditions, when the initiating event is generated, UKTS provides the necessary signals for the impact on the mechanisms and electrical fittings of technological safety systems. The mechanisms are started in a certain sequence, the closing / opening of valves occurs in accordance with the logic of the operation of technological systems.

In UKTS complexes, input (measurement of values) of analog signals occurs, input of discrete signals that determine the state of equipment and technological processes of the NPP power unit, logical processing, output of control and signaling commands by UKTS-M cabinets, in which the insulation resistance and voltage presence control units BKIN- are located 2.

Blocks for monitoring insulation resistance and voltage (BKIN-2) are designed to control the lowering of insulation resistance between the tires and the cabinet body; control of undervoltage by more than 5% at the outputs of one group of blocks and more than 10% at the outputs of another group of blocks; control over voltage increase of more than 5% on ± 15 V buses and more than 10% on 24 V tires of the UKTS cabinet.

The disadvantages of the block BKIN-2 include:

- low reliability of components;

- high heat dissipation and, as a consequence, the need to install fans in the cabinet where the unit is installed;

- designated service life of 10 years;

- MTBF of 50,000 hours;

For example, a control unit for insulation and the presence of voltage is known as part of a control cabinet, containing a vertically oriented rectangular frame formed by vertical racks and front beams fastened together, while the cabinet is made with compartments separated by a vertical partition: cable connections and functional equipment, the last of which is equipped retractable modular blocks, installed in tiers throughout the compartment, while on each tier for each modular block are fixed guides, and each modular block is equipped with guides for interacting with the guides of the corresponding tier and the clamp of the required position in the cabinet, providing independent extension of any block. At the same time, the position lock of the block contains a spring-loaded rod fixed to the base of the block, connected with a handle mounted for movement in a L-shaped hole made on the front panel of the block, with horizontal plates with rows of holes for entering into them corresponding spring-loaded latch (see patent for utility model RU 61471,27.02.2007).

The closest analogue of the claimed utility model is a voltage control unit, as part of the KSO KTPS-PN cabinet for collecting data on the state of NPP processing equipment, consisting of three subracks, one of which is used to install service units: power supplies, voltage control unit, network devices , the second and third are used to install functional blocks that provide the collection of analog signals - unified signals of direct current and voltage, signals from thermocouples and resistance transducers signals, as well as collecting and issuing discrete signals, and the functional blocks have a redundant internal structure for converting the input signal and are connected by a local line according to the RS-485 standard, which provides the possibility of sequential polling of functional blocks with a cycle of less than 20 ms, while filters are built into the functional blocks providing suppression of sinusoidal interference at frequencies of 50 and 60 Hz, while in analog blocks galvanic isolation in digital circuits and high-precision measurements are applied real ADCs, and the cabinet communication lines from the inputs of the functional blocks to the concentrators are completely duplicated (see Utility Model Patent RU 136608, 01/10/2014).

Utility Model Disclosure

The technical result consists in increasing the reliability of the developed unit for monitoring the insulation resistance and the presence of voltage (BKIN-A) of a unified set of technical equipment UKTS.

The claimed technical result is achieved by the fact that the control unit of insulation resistance and the presence of voltage BKIN-A, the base cabinet of the unified complex of hardware and software tools (UKTS) for automating the control of technological equipment of a power plant, is characterized by the fact that it contains a microcontroller with hard programming and contacts for connecting the unit to power circuits and terminal blocks.

Utility Model Implementation

The insulation resistance and voltage presence control unit (BKIN-A) located in the UKTS base cabinet of the UKTS unified complex of technical equipment is designed for call signaling circuits in order to control lower insulation resistance, voltage deviation at the power sources in the cabinet, and provide light signaling on the front panel.

The BKIN-A block provides a signal to the process signaling circuit when:

1) the deviation of the voltages at its inputs plus 15 V and minus 15 V by more than 5%, and for the input plus 24 V - more than 10%;

2) lowering the insulation resistance between the inputs plus 15 V, minus 15 V, plus 24 V, electric zero and the cabinet body to the level of 30 kOhm and below;

3) the appearance of alternating voltage between the inputs plus 15 V, minus 15 V, plus 24 V, electric zero and the cabinet body above 30 V.

The power consumed by the unit from power sources:

- plus 15 V - not more than 3.0 W;

- minus 15 V - not more than 2.0 W;

- plus 48 V - not more than 3.0 watts.

The unit is made in a unified design, in its design contains contacts for connecting to the power circuits of the unit itself, to external power circuits and terminal blocks. The unit is service and has a specific installation location in the cabinet.

The BKIN-A block is part of the group of service blocks of the cabinet of the basic UKTS and is an integral part of a unified set of technical means intended for designing automated control and process control systems and transmitting information about the state of technical equipment of the cabinet to the block control panel.

The assigned service life of the unit is at least 30 years.

MTBF of at least 200,000 hours

A high MTBF of the BKIN-A block is achieved through the use of highly reliable electronic components.

The low-power electronic components used in the unit do not require forced ventilation of the cabinet in which the unit is installed.

The BKIN-A unit is built using highly reliable electronic components and circuitry solutions that ensure the reliability of its operation in conditions of elevated temperature, humidity and when exposed to medium-hard electromagnetic radiation.

Additionally, the control unit of insulation resistance and the presence of voltage BKIN-A has the following features that are not available in the analogue.

The unit is resistant to interference at its inputs under the influence of electromagnetic fields of medium severity.

The block consists of the following nodes:

- voltage control;

- control of lowering the insulation resistance;

- formation of output signals;

- watchdog timer;

- auxiliary nutrition;

- indications;

- local area network.

The unit allows removal and installation of it back into the cabinet without turning off the power to the cabinet.

The unit in the process does not create interference that affects the performance of UKTS cabinets.

Thus, the technical result is achieved by a combination of essential features of a utility model.

Claims (1)

A control unit for insulation resistance and the presence of voltage in the base cabinet of a unified set of hardware and software for automating the control of technological equipment of a power plant, characterized in that it contains a microcontroller with hard programming and also contacts for connecting the unit to power circuits and terminal blocks.