RU149306U1 - HIGH RELIABILITY CURRENT CABINET CURRENT CABINET - Google Patents

Abstract

1. A cabinet of current signals of a complex of technical and software tools of increased reliability for automating the control of technological equipment of power plants, characterized in that it additionally contains at least three additional racks for installing an insulation and voltage control unit and the presence of voltage and power sources that have each channel output isolation diodes for the parallel operation of two sources per load, and at least one additional functional unit and additional vibration-proof terminal blocks for internal and external switching for connecting cable and wire conductors with a cross section from 0.03 mm to 2.5 mm “under the clamp” .2. A cabinet according to claim 1, characterized in that the cores are connected to the contacts of the flat connector with an insulation puncture. 3. A cabinet according to claim 1, characterized in that it contains a duplicated local area network.

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, well-known cabinets in general 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.

For example, a device for the cabinet of current signals UKTS-M of a unified complex of technical equipment (UKTS), designed to cross input and output circuits, as well as to place and provide operating conditions for service and functional units and power supplies in accordance with their technical characteristics, UKTS controls equipment technological systems of nuclear power plants. 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 provides for the centralized testing of protective devices (CCP) in normal operation without issuing control commands in order to identify defects and failures that are not detected during operation.

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

Known cabinet current signals KCO KTPS-PN for collecting data on the state of the technological equipment of nuclear power plants, consisting of three racks, 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 units, providing the collection of analog signals - unified DC and voltage signals, signals from thermocouples and resistance thermocouples, as well as the collection and generation of discrete signals, moreover, functional oki have a redundant internal structure of the input signal conversion and are combined by a local highway according to the RS-485 standard, which provides the possibility of sequential polling of function blocks with a cycle of less than 20 ms, while filters are integrated into the function blocks to suppress sinusoidal noise at frequencies of 50 and 60 Hz, at the same time, galvanic isolation in digital circuits and high-precision measuring ADCs are used in analog blocks, and cabinet communication lines from the inputs of functional blocks to Tractors are duplicated completely (see Utility Model Patent RU 136608, 01/10/2014).

The cabinet of current signals UKTS-M is the closest technical solution.

The cabinet of current signals UKTS-M is designed to accommodate and provide operating conditions for a set of service and logical blocks of UKTS-M: remote control units, technological protections; signaling, analog-discrete signal conversion, distribution of a unified signal, voltage stabilizers, mounting between mating connectors of blocks and cross terminal blocks.

The cabinet of current signals UKTS-M provides:

- input of analog signals for their conversion into a discrete signal;

- input of discrete signals about the state of technological equipment or after-algorithmic processing of signals from neighboring cabinets of the complex;

- output of discrete control and signaling signals or transmission of discrete signals for further algorithmic processing.

The disadvantages of the cabinet of current signals UKTS-M include:

- a soldered field of logical wire connections between functional blocks and intracabin electrical wiring;

- the need to maintain the temperature in the cabinet not higher than 40 ° C by organizing forced cooling (installation of fans);

- screw clamps on XT fields requiring periodic broaching;

- designated service life of 10 years;

- low reliability of equipment, MTBF of 50,000 hours.

The technical result consists in increasing the reliability of the developed and implemented device of the current signal cabinet SHTS KTPS-PN of the complex of technical and software tools of increased reliability (KTPS-PN), which was a further development of UKTS using new technologies, a new element base, and advanced technical solutions.

The claimed technical result is achieved in the claimed device as follows. The device of the cabinet of current signals of a complex of technical and software tools increased (SHTS KTPS-PN) for automating the control of technological equipment of power plants is characterized by the fact that it additionally contains at least three additional racks for installing an insulation and voltage control unit and the presence of voltage and power sources that each have its own output channels have isolation diodes for parallel operation of two sources on one load and at least one additional functional unit of unifiers of this design and additional vibration-proof WAGO terminal blocks for internal and external switching for connecting cable and wire conductors with a cross section from 0.03 mm ² to 2.5 mm ² “for clamping”.

In addition, in the device, the strands of the ribbon cable are connected to the contacts of the flat connector with a puncture insulation, which in the functional blocks of the internal diagnostics ensures early detection of the malfunction before the control function is fulfilled and the cabinet contains a duplicated local area network.

The claimed device is designed to accommodate and ensure working conditions of secondary power sources, service units and fault-tolerant functional blocks KTPS-PN with self-diagnosis; crossings of input and output circuits; mounting between block connectors and cross terminal blocks; collecting information from functional blocks inside cabinets using local networks of functional blocks (LSSF); transmitting information from cabinets over a local area network of peripheral controllers (LSPK) using serial interfaces for transmitting information over networks. Information about the generated (received and issued) signals is transmitted via a duplicated local RS-485 network to the upper block (station) level system through hubs. The cabinet device includes:

- crate service blocks, for the installation of blocks KTPS-PN:

- control unit for insulation and voltage presence BKIN1, ПУЖЖ 3.080.036;

- 2 peripheral PC controllers, ПУЖЖ 3.081.076-01;

- 4 power sources GN-26-12, ПУЖЖ 2.087.000-06;

- two crates for installing 36 functional blocks of KTPS-PN;

- HV switching field at 936 (26 × 36) for installation of the design inside cabinet jumpers;

- 36 terminal blocks XT with 68 contacts for the implementation of external communications;

- 5 terminal blocks XTN1 ... XTN5 for propagation of cabinet circuits;

- XTN6 terminal block for supplying signals and external power to the BKIN1 unit and the alarm board;

- XTS switching unit for inputting signals via the RS-485 interface;

- LED “FAILURE”.

The device is an integral part of the complex of technical and software tools of increased reliability, designed to create by design a system of automated control and monitoring of technological processes and transfer information about the state of technical equipment of the cabinet and technological equipment to the system of the upper block or station level.

The designated service life of the claimed cabinet device is at least 30 years.

MTBF of at least 450,000 hours

The high MTBF of the ShTTS KTPS-PN current signal cabinet is achieved through the use of highly reliable electronic components with low energy consumption, reliable intra-cabinet connections, partial duplication of circuits inside functional blocks, complete duplication of communication networks, and lack of forced cooling.

Additionally, the cabinet of current signals SHTS KTPS-PN has the following features that are not available for the analogue.

WAGO original, high reliability and vibration resistance terminal blocks for internal and external switching are installed in the cabinet, allowing connecting cable and wire cores with cross sections from 0.08 mm ² to 2.5 mm ² (external - “clamped” mount) and from 0.03 mm2 to 0.5 mm2 (internal - “clip-on” mount).

In order to provide a reliable electrical connection, the insulation piercing method was used to connect the conductors of the ribbon cable inside the cabinet to the contacts of the flat connector.

The functional blocks of the cabinet remain operational in the presence of one failure due to internal redundancy in the block.

In the cabinet service blocks are power sources, at the output of each channel they have isolation diodes, which provide the possibility of parallel operation of two sources for one load.

In the cabinet, in the functional blocks there is an internal diagnosis, which provides early detection of a malfunction before the failure of the control function.

Functional blocks of the cabinet allow their removal and installation back into the cabinet without powering down the cabinet.

The cabinet has a duplicated local area network.

When designing KTPS-PN, electronic components with low energy consumption were used that ensure minimal dissipation of electric power, which made it possible to refuse forced ventilation of the cabinet when it is completely filled with functional blocks.

The cabinet remains operational in the temperature range + 1 ... + 55 ° C.

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

The device operates as follows:

Functional blocks provide input of discrete and analog signals that determine the state of equipment and technological processes of a nuclear power unit, algorithmic processing of received signals in accordance with the design, and output of analog and discrete control and signaling signals or transmit them for algorithmic processing to other KTPS-PN cabinets of this subsystem.

Claims (3)

1. The cabinet of current signals of a complex of technical and software tools of increased reliability for automating the control of technological equipment of power plants, characterized in that it additionally contains at least three additional racks for installing an insulation and voltage monitoring unit and the presence of voltage and power sources that have each channel output isolation diodes for the parallel operation of two sources per load, and at least one additional functional unit and additional vibration-proof terminal blocks for internal and external switching for connecting cable and wire conductors with a cross-section from 0.03 mm ² to 2.5 mm ² "under the clamp". 2. A cabinet according to claim 1, characterized in that the cores are connected to the contacts of the flat connector with an insulation puncture. 3. A cabinet according to claim 1, characterized in that it contains a duplicated local area network.