DL/T 1971-2019Code of operation and maintenance for online condition monitoring system of hydro-generator sets (English PDF)

3.1 Operation

3.1.1 General provisions

3.1.1.1 The functions and performance of the online monitoring system shall meet the relevant regulations and requirements of DL/T 1197 and GB/T 28570.

3.1.1.2 During the operation of the online monitoring system, the components (devices) shall be free of leakage, water pollution, oil pollution and rust, and shall be free of abnormal sound and odor.

3.1.1.3 Operation and maintenance personnel shall conduct special training and have the ability to operate and maintain related equipment.

3.1.1.4 A proper amount of spare parts shall be provided.

3.1.2 The data analysis, status report review and alarm confirmation of the online monitoring system should be used to understand the monitored equipment and online Monitor system operation status.

3.1.3 The online monitoring system should be inspected regularly, and the inspection content should include the upper computer unit, data acquisition unit and sensor unit Wait for the working status of the equipment.

3.1.4 The alarm information of the online monitoring system should be confirmed in time, and if necessary, it should be confirmed on the spot or reported to the person in charge of duty or maintenance in time member.

3.1.5 When the online monitoring system has important alarm signals (such as equipment power failure, data storage failure, system communication failure, etc.), contact in time Maintenance personnel handle it.

3.2 Maintenance

3.2.1 General provisions

3.2.1.1 The maintenance content includes daily inspection, regular maintenance and defect handling.

3.2.1.2 The maintenance and technical improvement of the online monitoring system shall set up a special account and record the relevant content in time, involving software repairs.

Software backups should be carried out in advance for changes, upgrades, etc., and software version management should be carried out;

Electricity measures, and accident prevention, if necessary, system backup and data backup; work involving external communications should be approved by the other party Before proceeding.

3.2.1.3 Routine inspections should be carried out once a week; regular maintenance should be carried out once half a year (can be carried out in conjunction with the maintenance of unit equipment); defects found should be Deal with it in a timely manner, and keep track of the defects or failures that do not meet the conditions to ensure that they are in a controllable state and are Eliminate promptly in preparation.

3.2.2 Upper computer unit

3.2.2.1 Daily inspection

1) The working status of the following hardware equipment should be checked.

a) Host device;

b) Human-machine interface equipment;

c) Network equipment;

d) Network security equipment.

2) The working status of the following software should be checked.

a) process;

b) Data collection and processing;

c) Alarm function;

d) Communication function;

e) Data backup (if automatic data backup fails, manual backup should be performed).

3) The following performance parameters should be checked.

a) CPU load rate;

b) Memory usage;

c) Disk space;

d) Network usage rate.

4) The ambient temperature and humidity should be checked.

5) Check the system clock synchronization function.

3.2.2.2 Regular maintenance

a) Software, database and configuration files should be backed up;

b) Servers, workstations, optical fiber transmission equipment, network security equipment and cabinets should be cleaned;

c) Disk space should be organized;

d) The antivirus library code should be upgraded;

e) The software version should be upgraded.

3.2.3 Data acquisition unit

3.2.3.1 The daily inspection should check the following.

a) Device status;

b) Working power supply;

c) Human-machine interface;

d) Data collection status;

e) Failure alarm;

f) Data communication status;

g) Fan status.

3.2.3.2 Regular maintenance should include the following.

a) Software, database (if any) and file system backup;

b) Cleaning of related equipment such as data acquisition devices, industrial computers and panels;

c) Disk space arranging;

d) Virus database upgrade;

e) Software version upgrade.

3.2.4 Sensor unit

3.2.4.1 Daily inspection

Can be combined with the upper computer unit or data acquisition unit daily inspection work.

3.2.4.2 Regular maintenance

It can be carried out synchronously with the maintenance of the monitored equipment, and the maintenance method shall be carried out in accordance with the relevant regulations of DL/T 862 and DL/T 619.

3.2.5 Common fault types and treatment methods

See Appendix A.

4.1 Maintenance

4.1.1 General provisions

4.1.1.1 The contents of the maintenance shall include the handling of remaining defects and regular maintenance items. Regular maintenance items include. inspection and backup before power failure, Check and handle after power failure, and check after maintenance.

4.1.1.2 The periodic maintenance of the upper computer unit should be performed once a year, and the periodic maintenance of the data acquisition unit and sensor unit should be checked with the monitored equipment.

Repairs are carried out simultaneously.

4.1.1.3 The maintenance shall meet the requirements of the maintenance process, including. checking the name and model of the equipment, the position and direction of each component, drawings and Whether the site is consistent, etc., the inspection situation should be recorded, and the equipment replacement situation should be recorded.

4.1.1.4 Prior to overhaul, the remaining defects should be sorted out, and necessary spare parts, tools and instruments should be prepared.

4.1.1.5 When inspecting the module, the inspector should wear an anti-static wristband.

4.1.1.6 After the on-line monitoring system is overhauled, a systematic inspection should be carried out, and it can be put into operation after passing the acceptance.

4.1.2 Upper computer unit

See Appendix B for maintenance items and content.

4.1.3 Data acquisition unit

See Appendix C for maintenance items and content.

4.1.4 Sensor unit

4.1.4.1 Vibration, swing, pressure pulsation sensor

1) The maintenance shall be carried out in accordance with the relevant regulations of DL/T 862 and DL/T 619.

2) In the following situations, the sensor should be checked. Refer to DL/T 862 for the method. It can be used only after being qualified.

a) Continuous use for 4 years and above;

b) The output value is obviously abnormal;

c) Overhaul of unit class B and above;

d) Spare parts before use.

3) After maintenance, the following requirements should be met.

a) The sensor cable and the input and output cables of the local Proximitor should be well connected, the terminals should be fastened, and the wiring should be correct.

The cable joints at the cover and other positions are free of oil stains;

b) The sensor mounting bracket or base should be firm, with no abnormal position, and the installation gap should meet the requirements of relevant technical conditions;

c) There should be no scratches on the measuring surface of the swing sensor;

d) The key phase bumps or grooves should be intact with no abnormal positions;

e) The key phase sensor should have no sudden change in speed;

f) The connecting pipeline of the pressure pulsation sensor should be unblocked and there should be no leakage at the connection;

g) When the pressure pulsation sensor connection pipeline is emptied for the first operation, the pipeline should be exhausted;

h) The sensor is working normally.

4.1.4.2 Generator air gap and magnetic flux density sensor

1) When overhauling the unit equipment of level B and above, the sensor should be checked after the rotor is lifted out.

2) After maintenance, the following requirements should be met.

a) The sensor patch and lead are firm and reliable, there is no scratch on the surface of the patch, no crease or scar on the lead, and no damage to the insulation;

b) The sensor signal cable is not aging, and the grounding is firm and reliable;

c) The appearance of the proximitor is intact, without damage, oxidation or blackening, the product identification is clear and clear, and the fasteners are not loose or damaged.

hurt;

d) The sensor is working normally.

4.1.4.3 Partial discharge coupler of generator

1) The sensor should be checked and repaired when the unit equipment is Class C and above.

2) The maintenance contents are as follows.

a) When the coupler is installed at the neutral point of the generator, check the surrounding environment and the condition of the coupler regularly;

b) When the coupler is installed on the high-voltage side of the generator outlet, check that the appearance of the coupling device is not damaged, and the high-voltage connection is firm enough Lean, the supporting device is not loose;

3) During the generator withstand voltage test, the coupler shall be subjected to the withstand voltage test. For the test method, refer to the relevant regulations in GB/T 50150.

4) Other maintenance items shall be implemented in accordance with the relevant regulations of DL/T 356 and DL/T 846.4.

4.2 Test

4.2.1 General provisions

4.2.1.1 Test safety measures should be implemented before the test, and the test equipment should be qualified.

4.2.1.2 One person should operate and supervise during the test, and the test content should be recorded.

4.2.1.3 After the test, the relevant equipment should be restored to the state before the test.

4.2.1.4 The test analysis shall be carried out in accordance with relevant regulations and historical test data of the equipment.

4.2.2 Test items

4.2.2.1 Including host computer function test, data acquisition unit test, sensor test and systematic test.

4.2.2.2 Appendix D of test content, method and acceptance criteria.

Appendix A

(Informative appendix) Common fault types and treatment methods of online monitoring system Fault type Fault phenomenon Fault location Fault handling Sensor failure swing sensor value