One-stop supplier in the transformer parts industry
-
Oil-immersed transformer winding temperature monitoring
View More
Oil-immersed transformer winding temperature monitoring
Oil-immersed transformer winding temperature monitoring
View More -
Oil level temperature monitoring
View More
Oil level temperature monitoring
Oil-immersed transformer oil level temperature monitoring
View More
The following product types and descriptions are collected from the Internet. For more product information and prices, please contact us.
Transformer accessories:
| product category | Subclasses<br | Product Role | Benefits and Applications |
|---|---|---|---|
| Measuring and indicating devices | Pointer / Magnetic column typeoil level meter (MOG) | Visual on-site indication of the oil level in the reservoir by means of a float and mechanical linkage, usually with a low oil level alarm contact. | Pros. Simple structure, high reliability, no need for external power supply. Applications. Standard on almost all transformers with oil conservator, it is the centerpiece of site inspections. |
| Winding Thermometer (WTI) - thermal analog | The winding hot spot temperature is indirectly estimated by measuring the top oil temperature and superimposing on it an analog of the temperature rise generated by the load current. | Pros. Cost effective, approximates the thermal state of the winding and is key to controlling the cooling system and overload protection. Applications. Widely used in all types of oil-immersed power transformers as a basic means of winding temperature monitoring. | |
| Mechanical protection devices | Gas Relay (Gas relay) | Minor malfunctions. Collects the gas that is slowly generated inside and causes the upper float to operate to send an alarm signal. Critical Failure. Responding to the rapid oil flow generated by the internal short circuit, the lower baffle operates to send a trip signal. | Pros. It is very sensitive to various internal faults (turn-to-turn, core, etc.) and is the most unique protection for oil-immersed transformers. Applications. Required protection device for oil-immersed transformers with a capacity of 800 kVA or more. |
| pressure relief valve (with electrical contact) | When the internal pressure momentarily exceeds the spring setting value, the mechanical valve opens to release the pressure, and at the same time the linkage microswitch closes, outputting a trip signal. | Pros. Fast response time can effectively prevent the tank from deformation or bursting due to overpressure. Applications. The last line of safety for all fully sealed oil-immersed power transformers, especially effective against internal arcing short circuits. | |
| Cooling system components | Radiator | Utilizing the natural convection (or forced flow) of the internal and external oils, the heat of the transformer oil is dissipated into the surrounding air by increasing the surface area. | Pros. Mature structure, stable heat dissipation efficiency, modular installation. Applications. The main heat dissipating components of all oil-immersed transformers, configured in number and size according to capacity. |
| Cooling Fans (Cooling Fan) | Start and stop controlled by the thermostat, forced air blowing on the radiator surface to improve the convection heat transfer coefficient and enhance the heat dissipation effect. | Pros. Economically and efficiently increase the load capacity of transformers approx. 25%-40%. Applications. For transformers with forced air (AF) cooling (e.g. ONAF, OFAF). | |
| Oil Pump | Forced-driven insulating oil circulates between the transformer tank and the cooler, dramatically increasing the efficiency of internal heat exchange. | Pros. Maximum heat dissipation efficiency, which significantly reduces the size and weight of the transformer. Applications. For large-capacity transformers with forced oil circulation (OD) cooling (e.g. ODAF, OFWF). | |
| Insulation and sealing systems | Resin Impregnated Paper Capacitor Sleeves (RIP) | A resin-impregnated capacitor screen is used as the main insulation to safely lead the high-voltage leads out of the grounded tank. | Pros. Oil-free, fire and explosion-proof, resistant to high levels of fouling and maintenance-free, it represents the direction of technological development. Applications. City substations, offshore wind power, nuclear power plants and other occasions where safety and reliability are of paramount importance. |
| Self-regenerating/maintenance-free hygroscopes | The interior contains reusable molecular sieves. When saturated with moisture, the built-in heater will automatically activate to dry the molecular sieves to restore their moisture absorption capacity. | Pros. No need to manually replace the hygroscopic agent, greatly reducing the workload of operation and maintenance, and the protection effect is more durable and reliable. Applications. Remote areas, offshore platforms, unattended substations and all important transformers that want to reduce O&M costs. | |
| Capsule Oil Storage Cabinet | An oil-resistant elastic rubber capsule is installed in the oil storage cabinet to completely isolate the transformer oil from the atmosphere, and the expansion and contraction of the oil is realized through the deformation of the capsule. | Pros. Fundamentally prevents moisture and oxygen in the air from entering the oil, greatly delaying the aging of the insulating oil. Applications. Transformers with high reliability requirements are especially suitable for harsh environments such as humidity, heat and salt spray. | |
| Voltage regulator | On-Load Tap Changers (OLTC) | With the transformer running with a load, the winding taps are changed, thus smoothly adjusting the transformer ratio and stabilizing the output voltage. | Pros. The core equipment for ensuring the voltage quality of the power grid, which can realize automated voltage regulation. Applications. Transformers for grid hub substations, industrial users sensitive to voltage fluctuations, and transformers connected to the grid with new energy sources. |
| Non-excited tap changer (OCTC/DETC) | With the transformer completely de-energized and uncharged, the winding taps are changed by manual operation to accommodate long-term, seasonal voltage variations in the grid. | Pros. Simple structure, low cost and high reliability. Applications. Most distribution transformers and some power transformers that do not require frequent voltage regulation. |
Transformer online monitoring device:
| form | Monitoring parameters | goal | vantage |
|---|---|---|---|
| Winding temperature monitoring |
Winding hot spot temperature. Realization. 1. Fiber Optic Direct Measurement (FOTS). Pre-built the fiber optic sensor into the winding. 2. Thermal modeling indirect calculations. Estimated by IEEE/IEC standard algorithms based on parameters such as top oil temperature, load current, and ambient temperature. 3. Implantable RTD/Thermocouple. Mainly used for dry or cast transformers. |
Preventing the winding insulation from accelerated aging or burning out due to overheating is the core indicator that determines the load capacity and life of the transformer. |
Fiber optic method. Direct, precise, anti-electromagnetic interference, intrinsically safe. Thermal Modeling. Low cost, can monitor stock transformers for a wide range of applications. Synthesis. Enables dynamic load management, allowing for safe overloading and improved asset utilization. |
| On-line Dissolved Gas in Oil (DGA) Monitoring | H₂, CH₄, C₂H₄, C₂H₂, CO, CO₂ and other characteristic gas concentrations and gas production rates. | Diagnose internal latent faults (e.g. discharge, overheating, arcing). Known as the transformer's "blood test". | Fault diagnosis is highly accurate and can effectively distinguish the type and severity of faults. Strong early warning capability to detect hidden problems at very early stages of failure. Avoid the lag and human error of traditional offline sampling and assaying. |
| Oil level monitoring | Insulating oil level height and pressure (by oil level meter, e.g. magnetic overturn plate type, pressure type). | Prevent the oil level from being too low due to oil leakage, causing the core windings to be exposed and triggering insulation breakdown or poor heat dissipation. | Simple and intuitive, it quickly identifies serious oil leaks. Combined with the oil temperature data, you can determine whether the oil level change is abnormal. Low cost and essential monitoring item to ensure safe operation of the transformer. |
| Partial Discharge Monitoring (PD) | Discharge (pC), number of discharge pulses, and phase profile of discharge (PRPD). Sensor Type: Ultra High Frequency (UHF) Antenna, High Frequency Current Transformer (HFCT), Ultrasonic Sensor, etc. |
Detecting early defects within the insulation system (e.g. air gaps, impurities) and preventing them from developing into penetrating breakdown faults. | It is extremely sensitive and is the most effective means of detecting early defects in insulation. The general type of fault can be localized by graphical analysis. It can effectively prevent sudden collapse of insulation. |
| Casing online monitoring | Dielectric loss factor (tanδ), capacitance (C), and partial discharge of the casing. | Monitor the insulation status of high-voltage bushings to prevent explosions caused by moisture, aging, and internal defects. | Effective prevention of sudden and highly destructive casing explosions. Enables condition-based maintenance and avoids unnecessary outage testing. Dramatically improve equipment and personnel safety. |
| Core ground current monitoring | The magnitude of the current in the core grounding wire (industrial frequency, harmonic component). | Detects the presence of multi-point ground faults in the core to prevent localized overheating due to circulating currents and damage to the core. | Can effectively detect hidden core multi-point ground faults. Prevents more serious internal failures caused by localized overheating. Enables direct monitoring of the health status of the iron core. |
| On-line monitoring of microwater in oil | Microwater content (ppm), relative saturation (%RS) in insulating oil. | Monitor moisture levels in oil-paper insulation systems, which can severely reduce insulation strength and accelerate paper deterioration. | Real-time control of the "humidity" of the insulation system and accurate assessment of the risk of insulation deterioration. Directs oil filtration or drying treatment to effectively extend transformer life. Combined with temperature, moisture migration in solid insulation can be evaluated. |
| Online monitoring of on-load tap-changers (OLTC) | Vibro-acoustic characteristics of the switching process, switching timing, motor current, oil temperature, number of actions. | Monitor the mechanical components with the highest failure rates and diagnose problems such as worn contacts, jammed mechanisms, and sluggish response. | Effectively prevent power supply accidents caused by OLTC switching failure or jamming. Evaluation of the internal mechanical condition by non-intrusive means (vibration, acoustics). Provide accurate data support for OLTC maintenance. |
Transformer online monitoring system industry applications:
| Industry Sectors | application scenario | core requirement | Key values |
|---|---|---|---|
| Electric Utilities | Transformers at all levels in transmission grid hub substations, distribution sites, converter stations, etc. | Ensure the safe and stable operation of the power grid. Condition assessment and management of massive assets. Achieve condition-based maintenance and optimize investments. |
Enhancement of power supply reliability. Prevention of large-scale power outages. Achieve intelligent and lean management of grid assets. |
| Renewable Energy | Box-type transformers for photovoltaic power stations. Wind farm wind turbine box transformer and main transformer of the booster station. |
Responding to the intermittent and volatile nature of power generation. Realize unattended and remote operation and maintenance of remote sites. Secure power generation and boost revenue. |
Reduce O&M costs in the cost of kWh. Improve equipment availability and return on investment for new energy sites. (c) Ensuring stable access to "green power". |
| Industrial Manufacturing | General step-down transformers and shop transformers for large factories in steel, petrochemical, semiconductor, and automobile manufacturing. | Guaranteeing production continuity and avoiding huge economic losses caused by unplanned power outages. Cope with shock loads such as electric arc furnaces and rolling mills. |
Change "after-the-fact repair" to "before-the-fact warning". Protect critical production equipment and avoid costly shutdown losses. It is a key technology to protect the "lifeline" of industry. |
| Data Centers | Power supply transformers at all levels for large internet companies, financial and cloud computing data centers. | Zero-tolerance requirements for supply reliability. Meets Uptime Tier level certification requirements. Optimize power usage efficiency (PUE). |
Provide the most solid power protection for data centers. Avoid data loss and service interruptions due to power failures. Improve data center energy efficiency and operations. |
| Railway & Transportation | Main transformers for traction substations of high-speed railways and city subways. | Ensure that public transportation is safe and operates on time. Cope with the high current shock during train startup. Reliable operation in complex electromagnetic environments. |
Safeguard the smoothness and safety of transportation arteries. Avoiding train delays or stoppages and improving the quality of public services. It is an important part of the intelligent transportation system. |
| Critical Infrastructure | Hospitals, airports, ports, large commercial complexes, important buildings. | Safeguarding lives (e.g., hospital operating rooms). Ensure that core operations are not interrupted (e.g., airport navigation). Maintaining safety in public places. |
Provide underlying power support for the smooth operation of key sectors of society. It is the basic guarantee for the city's emergency management and safe operation. |
