Transformer oil chromatography online monitoring installation requirements and acceptance specification details
Date: May 18, 2026 02:12:02
- Non-stop installationOne of the core advantages of the oil chromatography online monitoring system is that it is connected to the existing sampling valve and oil return port of the transformer, so that the whole installation process does not require any power outage and does not affect the normal operation of the equipment.
- Location Selection: The monitoring mainframe should be mounted as close as possible to the transformer sampling valve, and the length of the tubing should be shortened to minimize dead volume in the oil line and response delays.
- Environmental requirementsIndoor installations need good ventilation, outdoor installations need to be equipped with protective cabinets to avoid direct sunlight and rain, and temperature control within the permissible range of the equipment.
- communications wiring: Signal lines and communication cables should be kept at a safe distance from power cables to avoid electromagnetic interference affecting data acquisition and transmission.
1. Pre-installation preparations
1.1 Site survey
Before installation, you need to go to the site to confirm: the location of the transformer sampling valve and oil return port, pipe diameter and interface thread specifications; the location and capacity of the available power supply; the access point of the communication network and the type of protocol; the installation location of the monitoring mainframe and the space dimensions; whether it is necessary to do the equipment foundations or brackets.
1.2 Preparation of materials and tools
Prepare according to the survey results: adapters and seals for sampling valves and return ports, oil-resistant stainless steel or copper tubing (length to be determined according to the installation distance), power cables and communication cables, main unit mounting brackets or foundations, as well as the necessary installation tools and test instruments.
1.3 Confirmation of installation program
The installation program needs to be approved by the substation operation and management department, which specifies the installation time window, the work ticket handling process, the safety measure requirements and the emergency plan in the installation process.
2. Standard installation process
| move | Job Description | Key control points |
|---|---|---|
| Equipment in place | Mounting the monitoring mainframe to a predetermined location and securing the cabinet or bracket | Horizontal mounting, vibration damping measures, reserved operating space |
| Oil connection | Connect the sampling pipe and oil return pipe and do a sealing check. | No leaks, correct line gradient, no air pockets |
| Electrical wiring | Connect the power and communication cables and ground them properly | Separate power supply circuit, shielded communication cable, reliable grounding |
| system debugging | Energization check, communication linkage, first sampling test | Each function module self-test passed, communication link is smooth |
| Calibration and acceptance | Verification of the system's detection accuracy using standard gases and issuance of acceptance reports | Indicators meet the requirements of the contractual technical agreement |
3. Receiving and inspection points
3.1 Appearance and installation quality inspection
Firm installation of equipment, piping connections without leakage, cable wiring standardization, clear and complete marking, good sealing of the cabinet.
3.2 Functional acceptance
Power on and start normal, self-test passed, automatic sampling function is normal, each gas component has an output value, data storage and query function is normal, over-limit alarm function is normal, and communication with the background is normal.
3.3 Performance acceptance
Using a standard gas mixture injection, verify that the system's detections for each gas are consistent with the standard values. Multiple consecutive injections are made to verify repeatability. Compare oil samples taken on site with offline laboratory to verify the consistency of online and offline data.
4. Frequently Asked Questions FAQ
4.1 Q. Does the installation have to be done by the supplier?
A: It is recommended that the first installation and commissioning be completed by the supplier. On the one hand, it can ensure the quality of installation, on the other hand, it is also a good opportunity to train the user operation and maintenance personnel. Subsequently, if you need to install the same type of equipment on other transformers, the trained O&M personnel can do it by themselves.
4.2 Q. What is the longest distance a fuel line can be pulled?
A: The longer the distance of the oil pipe, the longer the oil stays in the pipeline, and the test data reflects the state of the transformer not at the current moment but several minutes ago. It is recommended that the length of the oil pipe be limited to 10 meters, if a longer distance is required, the impact on the response time should be evaluated.
4.3 Q. What additional protection is required for outdoor installations?
A: Outdoor installations require, as a minimum, a protective cabinet (IP55 or higher) against rain and sun, an in-cabinet temperature control system (heater and fan), lightning and surge protection, and protection against insects and rodents. In high altitude or coastal areas there are additional special protection needs.
4.4 Q. What happens if there is a discrepancy between online and offline data at the time of acceptance?
A: It is normal that there is some deviation between the data of online monitoring and offline testing. Acceptance should be based mainly on the results of the standard gas feed, and the comparison between online and offline oil samples should be used as a reference. If the standard gas test is qualified but the oil sample comparison deviation is large, it is usually a problem in the sampling or degassing process.
4.5 Q: How long does it take to see stable data after installation?
A: After the system is first put into operation, it needs 2~3 sampling cycles of stable operation, and the test data of the first few times may be unstable due to the residual air or impurities in the pipeline. It is recommended to take the data of the first 24~48 hours as warm-up data, not as the basis of fault judgment.
5. Recommendations for post-installation operations and maintenance
5.1 Check the operational status of the system once a day for the first month to confirm that there are no leaks or fault alarms.
5.2 Establishment of a gas baseline database to record the concentration of each gas at the beginning of operation as a reference for subsequent trend determination.
5.3 Establish a regular maintenance schedule: carrier gas replacement intervals, column check intervals, annual calibration schedule.
Disclaimer: The content of this article is for technical exchanges and reference only, and does not constitute any form of procurement commitment or contract offer. Product technical parameters, configuration programs and prices are subject to the actual signed contracts and technical agreements. The technical data and cases involved in this article are from public information and engineering practice, if updated without notice.
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