Design of monitoring of partial discharges in windings of high-voltage motors

Contents

1. General provision

2. Project Name

3. Purpose of design works execution

4. Automation object

5. Information about the regulatory documents used

6. Organizational decisions

7. Basic Technical Solutions for Automation Hardware Selection

8. Key Information Solutions

9. Key Software Solutions

10. Placement and installation of automation equipment

11. Health and safety measures

General provisions

The introduction of the partial discharge monitoring system in the windings of the high-voltage electric motor A31000/6000 provides monitoring of the state of the electric motor using modern measurement tools based on microprocessor equipment, highly reliable electronic devices and equipment that allow control, protective interlocks and alarms in accordance with the requirements of PB 0351702 "General safety rules for organizations operating in the field of industrial safety of hazardous industrial facilities."

The A31000/6000 electric motor is located in category (D).

Basis of Design

- Contract No. 00113 of 15.02.2013 for the development of a set of detailed documentation;

- Technical Assignment for Development of Design and Estimate Documentation "Implementation of Partial Discharge Monitoring System in Windings of High-Voltage Motors of Togliattisintez CJSC" Appendix No. 1 to Contract No. 00113 dated 15.02.2013.

Project Name

"Implementation of the partial discharge monitoring system in the windings of high-voltage electric motor No. 4 in the water intake room No. 2 of Togliattisintez CJSC"

Purpose of Project Execution

The purpose of the project is to improve the reliability of the process equipment 17 deg. t/c 27/1, extension of the service life of the electric motor by timely commissioning, reduction of the costs of repairing the electric motor, and reduction of the costs of equipment downtime by warning

occurrence of sudden accidents of the electric motor.

Improving the quality and safety of technological processes, improving the efficiency of maintenance personnel, reducing the costs of technological processes.

Automation object

Technological object of automation is the A31000/6000, 17 electric motor otd. t/c 27/1, ZAO Togliattisintez.

Information about the regulatory documents used

- PB 0862203 "Safety Rules for Gas Processing Plants and Industries";

- PB 0862403 "Safety Rules in the Oil and Gas Industry";

- PUE "Electrical Installation Rules";

- Federal law of 21.07.97 No. 116FZ "About Industrial Safety of Hazardous Production Facilities" with changes of 07.08.00 No. 122FZ, of 10.01.03 No. 15FZ, of 22.08.04 No. 122FZ, of 09.05.05 No. 45FZ, of 18.12.06 No. 232FZ, of 30.12.08 No. 309FZ, of 30.12.08 No. 313FZ;

- RD 5034.698-90. "Automated systems. Requirements to the content of documents ";

- GOST 34.20189. "Types, completeness and designation of documents when creating automated systems";

- PB 0351702 "General safety rules for organizations carrying out activities in the field of industrial safety of hazardous production facilities."

- PB 0954003 "General Explosion Safety Rules for Explosion and Fire Hazardous Chemical, Petrochemical and Oil Refining Industries."

- GOST 18374 Electric rotating machines. General technical requirements.

Organizational decisions

To ensure the functioning of the partial discharge monitoring system in the windings of high-voltage motors of Togliattisintez CJSC

monitoring system operation group is required.

The operation group consists of the following parts :

- operation personnel (operational personnel of the shop, on duty

in the operator's room), using the monitoring system as part of its official duties;

- maintenance personnel performing repairs

and operational maintenance of the monitoring system.

The number of operating personnel is determined by the regulations on the operation of operational personnel in force at Togliattisintez CJSC. Total composition

group maintenance personnel - at least three people (concurrence of duties is possible).

The tasks of the operation group include performing the following works:

- control of a condition of partial categories in electric motors (in the presence of a luminescence of red indicators of a case of RP1) during change;

- periodic serviceability check of monitoring system with LED of device indicator PDTracII (daily), refer to PDTracII manual;

- Periodically read current and archived data via Ethernet interface or memory stick. Perhaps data read-out with USB of MEMORY port of the PDTracII device (at least once a week) see PDTracII manual the Analysis of data with PDTracII is carried out on the personal computer (ARMe) by means of the software of PDTracIIPro delivered complete with PDTracII on a CD disk;

- maintenance of monitoring system hardware in accordance with their operating manuals;

- repair or replacement of system components in case of failures

equipment and after the warranty service life is completed;

- system setting in case of change of parameters of Alert Relay signaling settings or replacement of hardware;

The maintenance personnel of the monitoring system shall operate in the following mode :

- duty personnel - round the clock (on shifts) in accordance with the approved work schedule of the technological facility ;

- operation of maintenance personnel is recommended in one shift (day).

For the operation team to operate efficiently, a clearly delineated list of the equipment assigned to the team members and its maintenance responsibilities must be developed.

Each member of the operation group shall have an electrical safety tolerance group not lower than the third .

Due to the fact that the Monitoring System Operation Team is set up as a unit of the Instrument Group, the basic organizational is not subject to change. Maintenance personnel of the operation group of the monitoring system can combine the maintenance of the system with other specialized activities.

Basic Technical Solutions for Automation Hardware Selection

7.1 Automation System Structure

The designed system is designed according to the hierarchical principle, and is a distributed two-level system.

Lower level of automation system:

- sensors, primary converters with unified output signals;

- secondary equipment installed on boards and in cabinets.

PDTrack permanent monitoring devices can be networked via an Ethernet interface through a switch, software installed on PDTracIIPro personal computer (APC) provides the reception and processing of data received from the PDTracII.

7.2 Upper level - AWS.

In the existing operator room, an IRIS automated workstation (AWS) can be organized based on PC and software PDTracIIPro (supplied with instruments PDTracII).

7.3 Automation Scope

Electric motors are provided with:

partial discharge monitoring system;

remote control of air temperature circulating in the motor housing (monitoring is carried out in the motor air duct);

remote monitoring of air humidity circulating in the motor housing (monitoring is carried out in the motor air duct);

7.4 Automation Instruments and Tools

To implement the above-mentioned automation and control volumes, electrical means and devices are used, mass-produced by the domestic and foreign industries.

All automation devices and devices placed have certificates of conformity and permits of the Federal Service for Environmental, Technological and Nuclear Supervision for use.

All sensors used in the design have unified output signals:

- analog (4... 20 mA), for temperature and humidity control;

Partial discharge monitoring device has PDTracII interface

Ethernet and USB for control of accounting process parameters.

Working documentation provides for the following monitoring and automation tools:

7.5 Partial discharge monitoring system

IRIS Power, Canada, a partial discharge monitoring system for non-stop motors of type PDTracII, is designed for automatic continuous measurement of the level of partial discharges (PD). It provides quality control of high-voltage insulation of electric motors. Manufacturer of Iris Power LP, Canada. The certificate of conformity of POCC CA.MO04.H00404 till 11.02.2014. Certificate of compliance of sensors QAE3075.010, QFM2101 ROSS DE.AG83.B04034 up to 31.07.2014.

7.6 Primary transducers of the monitoring system:

- EMC epoxy-mica sensors are high-frequency capacitive sensors used to detect partial discharges (PD) occurring in stator windings of motors;

- platinum resistance thermal transducer QAE3075.010 (Pt100), with output signal 4... 20 mA, manufactured by Siemens, necessary for remote recording of air temperature in the motor cooling circuit.

- humidity value converter QFM2101, with output signal 4... 20 mA, manufactured by Siemens, required to measure humidity in the motor cooling circuit.

7.7 Secondary device of the monitoring system.

The secondary device - PDTracII continuously measures the activity of partial discharges (PD) on the sections of the stator winding of the electric motor, records humidity and air temperature in the engine cooling circuit. When the system detects a high level or a sharp increase in the time of the CR, the device PDTracII activates the alarm.

In the future, the trend of measuring the CR signal over time and the latest measurement data of the CR, temperature and humidity can be analyzed.

The system provides:

- measurements of partial discharges;

- determination of exceeding absolute value of CR setpoint of current measurement range;

- recording of air temperature and humidity in the engine cooling circuit.

7.9 Power supply of automation equipment complex

AC voltage of 380/220 V and frequency of 50 Hz is used for power supply of instruments and automation equipment.

Power supply is made in electrical part of the project.

Key Information Solutions

8.1 Content of information support

Information support consists of:

Documents:

- regulating the operation of the "Partial discharge monitoring system in the windings of high-voltage electric motors of Togliattisintez CJSC";

- regulating the operation of maintenance personnel "Partial discharge monitoring systems in the windings of high-voltage electric motors of Togliattisintez CJSC ";

- procedures and standards, in accordance with which certain actions are performed during the functioning of the "Partial discharge monitoring system in the windings of high-voltage electric motors of Togliattisintez CJSC ";

Information that is generated during operation:

- measured and recorded values of parameters and modes "Partial discharge monitoring systems in windings of high-voltage electric motors of Togliattisintez CJSC";

- technical and technological information;

- reporting and service information.

8.2 Input and output signals:

- input signals for PDTracII are signals from capacitive sensors EMS IRIS located in the 6 kV connection box of the engine power supply. Value of signals value from sensors from 100 mV to 4 volts.

- input signals for the PDTracII are the signal from the temperature sensor of the motor cooling system located in the air duct, to the cooler, sensor type QAE3075.010 Siemens. Signal type "Current loop 4... 20 mA."

- input signals for PDTracII is the signal from the humidity sensor located in the air duct of the motor cooling system, after the cooler, type of sensor QFM2101 Siemens. Signal type "Current loop 4... 20 mA."

- the output signal is Alert Relay Contact (dry contact 12250 V 500 mA) indicating that the level of partial discharges is exceeded, or the temperature of the cooling air is exceeded, or the humidity of the cooling air exceeds the setpoints in PDTracII.

The PDTracII device is equipped with Ethernet and USB ports (USB 2.0).

Placement and installation of automation equipment

Installation of automation systems and cable products is carried out in accordance with the working documentation, taking into account the requirements of manufacturers of instruments and automation equipment, in compliance with the requirements of regulatory documents PUE, SNiP 3.05.0785 "Automation Systems"

ensuring safe conditions during works. Mounted instruments and means of automatics, conduit, pipes, metal wiring shall be connected to metal structures having reliable electrical connection to the common grounding circuit.

EMC IRIS Partial Discharge Sensors are located in the 6 kV terminal boxes of the motor connection (or in the box adjacent directly to the terminal box). The terminal box is placed on the motor housing. EMC IRIS sensors are coaxially connected to the Coupler Termination Box.

The switching box is connected by coaxial cable to the device PDTracII.

The Coupler Termination Box is located in the immediate vicinity of the PDTracII device.

The temperature sensor is installed on the air duct of the electric motor cooling system, in the direction of air movement to the cooling radiator.

The humidity sensor is installed on the air duct of the electric motor cooling system, in the direction of air movement after the cooling radiator.

Electrical connection of temperature and humidity sensors to the PDTracII device is performed by two-core shielded cable in the metal tube.

The instrument is PDTracII placed on a column supporting a reinforced concrete slab with an electric motor and a compressor installed on it.

The power cable of PDTracII of the T/K 27/1 electric motor is laid in a separate box in a floor stroba in axes B/118, V/1-18, V/11815, further conducting is carried out in in a metal hose in a tray indoors of T/K1 units - T/K4 to the PDTracII device of electric motor 27/1.

Alarm cable Alert Relay and cable of Ethernet line are laid in a separate duct in the floor line in axes B/118, V/1-18, V/11815, then wiring is carried out in the metal box in the tray inside the room of units T/K1 - T/K4 to the device PDTracII electric motor 27/1.

Electrical circuits from temperature and humidity sensors, alarm circuits are made by control cables with copper cores KPSEngFRLS with low smoke emission, which do not spread combustion with fire resistance of 180 minutes.

Power supply circuits of PDTracII devices are made by VBGngLS cable with low smoke emission, which does not propagate combustion.

Ethernet lines are made by "Twisted Pair" cable of EXGPVE.

Cable types are selected in accordance with special requirements for measuring circuits, recommendations of instrument manufacturers and electrical installation rules.