RU149302U1 - UNIT OF RESISTANCE RESISTANCE AND AVAILABILITY OF THE BASIC CABINET OF THE COMPLEX OF HIGHER RELIABILITY TECHNICAL-SOFTWARE MEANS - Google Patents

Abstract

1. The control unit of insulation resistance and the presence of voltage in the cabinet of the basic complex of hardware and software tools of increased reliability for automation of control of technological equipment of a power plant, characterized in that it contains a microcontroller with hard programming, which implements a local network to transmit information about the state of the unit, input and output signals of the unit to the upper level, as well as contacts for connecting the unit to power circuits, local network and terminal blocks. 2. The control unit for insulation resistance and the presence of voltage according to claim 1, characterized in that it contains indicators on the front panel of the unit.

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.

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.

UKTS manages the equipment of technological systems of various power plants, including nuclear (nuclear power plants) and thermal (TPPs).

In UKTS complexes, input (measurement of values) of analog signals takes place, input of discrete signals that determine the state of equipment and technological processes of the power unit, logical processing, output of control and signaling commands from UKTS-M cabinets.

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 installed on each tier them corresponding spring-loaded latch (see patent for utility model RU 61471, 02.27.2007).

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 of unified signals of direct current and voltage, signals from thermocouples and resistance thermocouples functions, 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 highway 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 noise at frequencies of 50 and 60 Hz, while in analog blocks galvanic isolation in digital circuits is applied and high-precision measurements full 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).

The insulation and voltage control unit is designed to control the lowering of the insulation resistance between the tires and the cabinet body and to control the lowering of the voltage of the power sources in the cabinet in accordance with the functional purpose and for the correct and safe control of the power plant mechanisms.

Blocks of this type, for example, BKIN-1, are installed in the UKTS-M cabinet, which provides conditions for its normal functioning, designed to control the decrease in 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 well-known block BKIN-1 include:

- lack of redundancy of the logical circuit;

- the lack of the ability to transmit information over digital local area networks;

- lack of internal diagnosis;

- low reliability of electronic 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

Utility Model Disclosure

The technical result is to increase the reliability of the developed unit for monitoring the insulation resistance and the presence of voltage (BKIN) of the complex of technical and software tools of increased reliability KTPS-PN.

The claimed technical result is achieved by the fact that the control unit of insulation resistance and the presence of voltage of the cabinet of the basic complex of technical and software tools of increased reliability (SB KTPS-PN) for automating the control of technological equipment of a power plant is characterized by the fact that it contains a microcontroller with hard programming that implements local a network for transmitting information about the state of the unit, input and output signals of the unit to the upper level, as well as contacts for connecting the unit to circuits Ethan, network and terminal blocks.

The control unit for insulation resistance and the presence of voltage is also characterized by the fact that it contains indicators on the front panel of the unit.

Utility Model Implementation

The unit uses a microcontroller with hard programming. The microcontroller performs the functions of:

- reading input signals;

- formation of information messages;

- development of output signals in accordance with the functional diagram. Block for monitoring insulation resistance and voltage (BKIN),

the complex of technical and software tools of increased reliability placed in the cabinet of the basic SHB KTPS-PN is intended for the organization of ringing alarm circuits in order to control the decrease in insulation resistance in the cabinet, the voltage deviation at the power sources, to provide light signaling on the front panel and to provide all the necessary information in digital form to the local network of functional blocks (LSSB).

The block provides:

1) voltage control on the 5.7 V and 12 V buses, as well as on the outputs of the power supplies to the dividing diodes;

2) insulation resistance control between voltage control inputs, electric zero and the case when powered by cabinet sources, as well as when the cabinet is de-energized when powered by an external voltage of 48 V (24 V for individual performance);

3) issuing a ringing signal and signaling with LEDs on the front panel of the unit:

- when lowering the voltage at the inputs of the control busbars 5.7 V and 12 V by more than 5% (5.7-0.285 V and 12-0.6 V);

- at lower or higher voltages at the control inputs of 6.1 V power supplies by more than ± 0.285 V, 12.4 V more than ± 0.6 V, and for 24.4 V input by more than ± 2.4 V ;

- when the insulation resistance is reduced to a level of 30 kOhm and below (the deviation in the signal output from the setpoint of 30 kOhm is not more than ± 10%);

- block failure alarm;

- the issuance of information about the state of the block, in the local network of functional blocks LSSB for input into the peripheral controller;

- the issuance of details (type of unit, serial number, date of manufacture) for input into the peripheral controller.

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

The BKIN block is part of the group of service blocks of the cabinet of the basic SB KTPS-PN and is an integral part of the complex of hardware and software tools of increased reliability, designed to create automated control and process control systems by design and to transfer information about the state of technical equipment of the cabinet and technological equipment to the system top block or station level.

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

MTBF of at least 200,000 hours

A high MTBF of MTBF 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.

In addition, the control unit for insulation resistance and the presence of voltage BKIN has the following features that are not available in the analogue.

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

A microcontroller with hard programming is installed in the block, which ensures the operation of the block and its diagnostics.

In the block on the microcontroller, a local network is implemented to transmit information about the state of the block, the state of the input and output signals of the block to the upper level.

The unit provides diagnostics for detecting malfunctions by indicating on the front panel of the unit and transmitting information in digital form over the local network to the upper level.

Thus, the unit has the capabilities that are absent from the analogue, which is extremely important, since national and international safety requirements are imposed on the operability of equipment providing the technological process, for example, nuclear power plants.

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 detection of a malfunction in the block occurs as a result of checking the RAM during the initialization process, as well as by checking the checksums and diagnosing the hardware during the operation of the block.

The watchdog node is intended for hardware reset of the microcontroller when it hangs. If the microcontroller does not start after the reset by the watchdog timer, the watchdog timer will continue to send reset pulses with a frequency of 40 ms and a fault signal will be displayed on the front panel of the unit.

The technical result in KTPS-PN is achieved by the combination of the above additional features.

Claims (2)

1. The control unit of insulation resistance and the presence of voltage in the cabinet of the basic complex of hardware and software tools of increased reliability for automation of control of technological equipment of a power plant, characterized in that it contains a microcontroller with hard programming, which implements a local network to transmit information about the state of the unit, input and output signals of the unit to the upper level, as well as contacts for connecting the unit to power circuits, local network and terminal blocks. 2. The control unit of the insulation resistance and the presence of voltage according to claim 1, characterized in that it contains indicators on the front panel of the unit.