RU176607U1 - Control device for electromechanical panels of relay protection and automation - Google Patents

Abstract

The utility model relates to the field of relay protection and automation (RPA) and can be used in power plants and substations operating relay protection equipment made on electromechanical relays mounted on panels of insulating material (electromechanical panels). The technical result is an increase in the functionality and information content of the control, a reduction in the time for detection and elimination of malfunctions arising from the operation of electromechanical relay protection and automation panels, and an extension of their service life. The device 1 contains a microcontroller 2, equipped with a data exchange port 4, interfaces 5 and 7 with connectors for discrete and analog inputs 6 and 8, respectively, and an interface module 10. Module 10 contains cable parts 11 of the interface connectors fixed to the microcontroller 2 structure. To the contacts of the cable parts 11 with flexible wires 15 are connected branch clamps 12 and equipped with a split core current transformers 14, designed to be removed directly from the mounting wires 13 of the controlled panel 9 of the voltage and current signals, respectively. The microcontroller 2 is programmed with the ability to register and functional identification of signals recorded by module 10. 2 z.p. f-ly, 1 ill.

Description

Technical field

The utility model relates to the field of relay protection and automation (RPA) and can be used in power plants and substations (PS) operating relay protection equipment made on electromechanical relays installed on panels of insulating material (electromechanical panels).

State of the art

Among relay protection devices operating in electric power facilities, a high proportion is made up of electromechanical relays. Mass replacement of such devices with modern microprocessor devices is associated with high material costs and is not planned in the near future. This makes it urgent to effectively monitor the operation of electromechanical panels using modern microprocessor technology (programmable microcontrollers).

There are known central alarm cabinets currently used at existing substations for monitoring electromechanical relay protection and automation panels (substation 220 kV "Tyurlema" branch of PJSC "FGC UES" - MES Volga, substation 110/35/10 kV "Katrasi" branch of PJSC "IDGC of Volga" - "Chuvashenergo"). The central alarm cabinets are connected by precinct alarm busbars with the operation outputs of the electromechanical protections mounted on the relay protection and automation panels, and signal the panel on which this or that protection worked, without monitoring its operation and not registering the signals necessary for the analysis of emergency situations and the protection functioning.

Microprocessor-based monitoring and control devices are known that record RPA signals with their time stamps on their discrete and analog inputs and transmit the registration results to the substation's automated process control system (ACS TP) and / or to the operator's automated workstation (AWP) for subsequent analysis of pre-emergency and emergency situations [patents RU 87840, RU 2195707. RU 115970, RU 115971, RU 154171].

These devices contain microprocessor units programmed with the ability to perform these functions, ports for exchanging data with the equipment of automatic process control systems, and interfaces of discrete and analog inputs.

As a prototype, a relay protection device according to patent RU87840, containing a microcontroller, which is equipped with

serial data exchange port, interfaces with connectors for discrete and analog inputs and is programmed with the ability to register signals at these inputs and output registration results through a serial data exchange port.

The analog and digital inputs of the prototype device are interfaced via interface connectors with the corresponding output connectors of the relay protection device under control. This does not create obstacles for a full-fledged analysis of the operation of flexible (reprogrammable) relay protection and automation devices built on a microprocessor basis, in which the volume and content of the information output through the output interfaces can vary programmatically in accordance with the control tasks.

The disadvantage of the prototype is manifested when it is used to control such relay protection devices that are built on a rigid (non-reprogrammable) hardware basis, i.e. on electromechanical relays. The prototype and other known microprocessor control devices for relay protection and automation devices can only control the output signals of the electromechanical panel, which do not carry enough information to analyze emergency and pre-emergency situations, assess the current status, parameters and functioning of relay protection equipment installed on the panel.

This limits the functionality and information content of the control of electromechanical relay protection and automation panels, as a result of which there is no possibility:

- determine the type and level of protection that worked and returned to its original state;

- localize the failed RPA node;

- to analyze the situation on the waveforms of currents and voltages of the pre-emergency, emergency and post-emergency modes, combined in time with the internal signals of the relay protection and automation panels, reflecting the operation of the relay protection stages, the appearance and nature of the faults.

The technical result of the claimed utility model is to increase the functionality and information content of the control, reduce the time for detection and elimination of malfunctions that occur during the operation of electromechanical panels of relay protection and automation devices, and extend their service life.

Utility Model Disclosure

The subject of a utility model is a control device for an electromechanical panel of relay protection and automation, containing a microcontroller, which is equipped with a serial data exchange port, interfaces with connectors for discrete and analog inputs and is programmed with the ability to register signals at these inputs and issue registration results through a serial data exchange port, characterized in that the module for interfacing a microcontroller with a controlled panel is introduced, comprising tive microcontroller cable side interface connectors, the contacts of which are connected by flexible wires piercing connectors and provided with split-core current transformers are designed for detachably mounting a wire-controlled voltage and current signals panel respectively, and a microcontroller programmed to identify functional filmed signals during their registration.

This allows you to get the specified technical result.

The utility model has development, which consists in the fact that:

- the removal of voltage signals to the analog inputs is made through fuses;

- removal of voltage signals to discrete inputs is performed through resistor dividers with voltage limitation.

Implementation of a utility model, taking into account its development. The figure shows a diagram of a device for monitoring an electromechanical panel, indicated by a dotted line.

1 - the claimed device;

2 - microcontroller;

3 - microprocessor unit;

4 - serial data exchange port;

5 - interface of discrete inputs 6;

7 - interface of analog inputs 8;

9 - controlled panel;

10 - module interface with the controlled panel 9;

11 - cable parts of interface connectors;

12 - branch clamps for receiving voltage signals from the mounting wires 13 of the panel 9;

14 - current transformers equipped with a detachable core for picking up current signals from the mounting wires 13;

15 - flexible wires connecting the clamps 12 and transformers 14 to the cable parts 11 of the connectors;

Clips 12 are connected to the voltage signal pick-up points selected on panel 9. Transformers 14 enclose the mounting wire 13 at the points selected for picking up current signals.

As clamps 12, for example, clamp-couplers of type ЗОВ 2 of MEYERTEC firm or type ЗПО-2 of firm 1ЕК can be used, and as transformers 14 current transformers of type TT made by LEM or type ССТ made by TDK ,

Block 3, which forms the basis of microcontroller 2, is a microprocessor with non-volatile program memory, in which the functions of microcontroller 2 are programmed, and data memory. Block 3 and, accordingly, the controller 2 is programmed with the possibility of registering signals at the interface inputs 6, 8 with the output of the registration results through port 4, as well as with the possibility of functional identification of the recorded signals when they are registered.

The nodes 3, 4, 5 and 7 of the microcontroller 2, connected by a bus 16, together with its other elements not shown in the figure (power supply, configuration interface, display unit) are placed on the general microcontroller construct - a printed circuit board or a supporting frame.

The module 10 includes cable parts 11 of connectors that are mounted on the construct of the microcontroller 2, to the contacts of which flexible wires 15 are connected to clamps 12 and transformers 14. Fuses 17 can be integrated into the wires 15 through which the voltages to the analog inputs 8 are removed, and wires for picking up voltage signals to discrete inputs 6 - resistor dividers 18 with voltage limitation.

The controlled panel 9 and its mounting wires 13, indicated by a dotted line in the figure, are not included in the device 1.

The construct of the microcontroller 2 is located on the panel 9 or near it. The interface module 10 is connected to interfaces 5 and 7 and is mounted on the microcontroller by 2 cable portions of 11 connectors.

In accordance with the diagrams (functional, basic, mounting) of the panel 9 and the control algorithm previously developed and programmed in block 3, control points for signal pick-up on the panel 9 are selected.

The removal of voltage or current signals from the insulated wires 13 of the panel 9 is carried out without violating its installation.

To remove the voltage signal (discrete to input 6 or analog to input 8) with the appropriate clip 12, pierce the insulation of the mounting wire 13 at the selected test point. The design of the clamp 12 provides a reliable electrical connection of the wires 13 and 15. To remove the current signal to the analog input 8, the detachable core of the corresponding transformer 14 surround the wire 13 at the selected control point.

In order to suppress the induced noise for signal pickup, as a rule, twisted pairs of wires 15, shown in the figure in a single line, are used.

The device operates as follows.

Discrete and analog signals removed from panel 9 are fed to inputs 6 and 8 and converted by interfaces 5 and 7 into a form suitable for digital processing in block 3. (For this, the interface of 5 inputs 6 is equipped with comparators, and the interface 7 of inputs 8 is equipped with analog-digital converters). The data received from interfaces 5 and 7 is sent to block 3, which registers them, storing them in non-volatile memory along with the corresponding time stamps and attributes that identify the signal being recorded at the functional level. Block 3 generates data files from the registration results, which, upon request, or periodically transmits via port 4 (made, for example, as an Ethernet port) to the automated process control system to the data collection server and / or directly to the operator's workstation. The internal clock of the microcontroller 2 software or with hardware support, implemented in block 3 for receiving time stamps, is periodically tuned through port 4, for example, via the SNTP protocol (simplified NTP time synchronization protocol).

Introduction of the module 10, which interconnects the microcontroller 2 with the panel 9 and contains the cable parts 11 of the interface connectors fixed to the microcontroller 2 construct, to the contacts of which the branch clamps 12 and current transformers 14 equipped with a detachable core are connected, as well as the additional programming of the microcontroller 2, which provides functional identification of the recorded signals during their registration, allow to obtain the above technical result.

Provided by the claimed utility model, the possibility of removing internal signals of electromechanical relay protection and automation devices without disturbing their wiring, subsequent digital processing, identification and registration of these signals allows you to control and analyze together the most informative signals that characterize the functioning of the relay protection and automation circuit. Improving the functionality and information content of the control and, as a result, reducing the time for detecting and eliminating malfunctions of electromechanical relay protection and automation panels makes it possible to extend their life without compromising the reliability of power supply.

Application examples

Below, as examples, for two types of electromechanical panels, lists of internal signals are given that, using the claimed utility model, are removed from the controlled panel, identified, recorded and transmitted to the industrial control system.

Panel type EP3-1636, which implements the functions of a three-stage differential protection (DZ) and current directional protection of the zero sequence (TNZNP) and a device for redundant circuit breaker failure (URO)

Discrete signals taken from the panel to inputs 6:

1) the start and trip signal of the first stage of the remote sensing;

2) start signal of the second stage DZ;

3) the start signal of the III stage DZ;

4) a signal of readiness for automatic acceleration of the second stage of the remote sensing;

5) start-up signal of the second stage of TNZNP;

6) start signal III stage TNZNP;

7) start signal of the IV stage TNZNP;

8) a blocking response signal when swinging to the start of I, II stages of DZ;

9) a blocking response signal when swinging to the start of the third stage of DZ;

10) the start signal of the output relays of the I complex of protections;

11) the start signal of the output relays of the II complex of protection;

12) voltage circuit fault signal;

13) a signal of a malfunction of the power supply unit of the DZ set;

14) a signal of a malfunction of the power supply unit kit TNZNP;

15) the response signal of the measuring body of the relay I, II stages DZ;

16) the response signal of the measuring body relay III stage DZ;

17) the response signal of the current relay UROV.

Analog signals taken from the panel to inputs 8:

Voltage Signals:

1) phase A voltage signal;

2) phase B voltage signal;

3) phase C voltage signal;

4) zero sequence voltage signal.

Current Signals:

1) phase A current signal;

2) phase B current signal;

3) phase C current signal;

4) neutral current signal.

Panel type DF3-201, which implements the functions of differential-phase protection

Discrete signals taken from the panel to inputs 6:

1) the start signal of the transceiver;

2) the response signal of the trigger to shut off;

3) the response signal of the phase comparison body to the shutdown;

4) the response signal of the output protection relay II protection kit;

5) transceiver malfunction signal;

6) a fault signal of power supplies I, II sets of protection;

7) a signal of a malfunction of voltage circuits as part of the II set of protections.

Analog voltage signals taken at inputs 8:

1) receiver signal;

2) transmitter signal.

Claims (3)

1. The control device of the electromechanical panel of relay protection and automation, containing a microcontroller, which is equipped with a serial data exchange port, interfaces with connectors for discrete and analog inputs and is programmed with the ability to register signals at these inputs with the output of the registration results through a serial data exchange port, characterized in that a module for interfacing a microcontroller with a controlled panel is introduced, containing cable fixed to the microcontroller parts of the interface connectors, to the contacts of which the branch clamps and current transformers equipped with a detachable core are connected with flexible wires, intended for removal of voltage and current signals from the control panel wires, respectively, and the microcontroller is programmed with the possibility of functional identification of the recorded signals when they are recorded. 2. The device according to p. 1, characterized in that the removal of voltage signals to the analog inputs is made through fuses. 3. The device according to p. 1, characterized in that the removal of voltage signals to the digital inputs is made through resistor dividers with voltage limitation.

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