Overview of High Voltage Main Power Transformer

High Voltage Standard Potential Transformer HJ series (66-500KV) is a device used to convert high voltage to lower voltage. It is critical in power systems, especially high-voltage transmission and distribution networks. The primary function of the high-voltage main power transformer is to ensure the stable operation of the power system while providing the required voltage for various power equipment.

Functional Principle of High Voltage Standard Potential Transformer HJ series (66-500KV)

• Voltage conversion: The most basic function of a high-voltage main power transformer is to perform voltage conversion. It reduces the high voltage in the power system to the voltage level required by the user. By changing the turn ratio of the primary side (high-voltage side) and secondary side (low-voltage side) coils, voltage rise and fall can be achieved.
• Impedance matching: Transformers can also play a role in impedance matching. For different loads, their impedance values also vary. Through the transformer’s voltage transformation effect, the impedance of the load can be matched with the impedance of the power supply system, thereby ensuring stable current transmission.
• Voltage regulation: By changing the number of turns of the primary side coil or the number of turns of the secondary side coil, the output voltage can be adjusted. In the power system, transformers are used to achieve segmented voltage control to meet the electricity needs of different users and equipment.
• Filtering function: Some particular types of high-voltage main power transformers also have a filtering function, which can filter out harmonics and reactive power components in the power supply and improve the quality of the power supply.

Specifications of High Voltage Standard Potential Transformer HJ series (66-500KV)

The HJ series High Voltage Standard Potential Transformer covers voltage ratings from 66KV right up to 500KV. This range suits diverse high-voltage measurement needs in power grids and substations. It delivers precise voltage transformation. Key accuracy classes include 0.2, 0.5, and 1.0. Class 0.2 means measurements stay within 0.2% error. This high precision is vital for billing and protection systems.

Reliable insulation is critical. The HJ series uses proven methods: epoxy resin casting or high-strength porcelain. These materials provide excellent electrical strength. They withstand harsh environmental conditions. The unit operates reliably between -40°C and +40°C ambient temperature. It handles high altitudes too, up to 1000 meters above sea level.

Rigorous testing ensures safety and performance. Each transformer undergoes power frequency withstand tests. It also passes lightning impulse tests. These simulate real-world electrical surges. The rated voltage factors are 1.2 for system voltages below 300KV. For 300KV and above, the factor is 1.5. This defines its short-term overvoltage capability.

The primary winding connects directly to the high-voltage line. The secondary winding outputs a standardized low voltage. This is typically 100V or 100/√3 V. Secondary terminals are clearly marked. Standard burdens match common metering and protection devices. The transformer design minimizes errors from temperature changes. It ensures stable readings year-round. Installation follows standard practices for high-voltage equipment. Proper grounding is essential. Regular maintenance checks verify ongoing accuracy and insulation integrity. Surge arrestors are recommended for added protection. The HJ series provides dependable voltage measurement for critical high-voltage applications.

Applications of High Voltage Standard Potential Transformer HJ series (66-500KV)

The HJ series High Voltage Standard Potential Transformers handle voltages from 66kV right up to 500kV. These transformers measure voltage very accurately. They are vital tools for power system testing and calibration work. High accuracy is their main job. They provide a known, reliable voltage reference.

Utilities and testing labs use these transformers constantly. They calibrate other voltage measuring devices. This ensures all meters and instruments read correctly. Accuracy matters for fair billing and safe grid operation. The HJ transformers are the trusted standard for this work.

Technicians use them in high voltage metering labs. They also use them directly at substations for field tests. Testing protective relays is another key task. Relays guard equipment from damage during faults. The HJ transformers provide the precise voltage signals needed to check relay settings. This keeps the protection system reliable.

The transformers step down high line voltage. They make it safe and manageable for test equipment. Workers connect standard meters to the transformer’s low voltage output. They compare these readings to the known high voltage input. This process verifies the accuracy of the entire measurement chain.

Regular calibration of the HJ transformers themselves is essential. Special labs perform this using even higher standards. This maintains traceability to national standards. The HJ series meets strict international accuracy classes. This guarantees dependable performance under demanding conditions. They are built tough for the harsh electrical environment. Their stable performance supports safe, efficient power transmission and distribution.

Company Profile

PDDN Photoelectron Technology Co., Ltd. is one of the leading enterprises in power electronics technology and power products, which is fully involved in developing solar inverters， transformers, voltage regulators, distribution cabinets, thyristors， modules， diodes， heaters, and other electronic devices or semiconductors. We will be committed to providing users with high-quality, efficient products and considerate service.

It accepts payment via Credit Card, T/T, West Union, and Paypal. PDDN will ship the goods to customers overseas through FedEx, DHL, by sea, or by air. If you want high-quality High Voltage Standard Potential Transformer HJ series (66-500KV), please send us inquiries; we will be here to help you.

Payment Methods

L/C, T/T, Western Union, Paypal, Credit Card etc.

Shipment

By sea, by air, by express, as customers request.

Storage Conditions

1) Store in a dry environment at room temperature.

2) Avoid damp and high temperature.

3) Use immediately after opening the inner packing bag.

5 FAQs of High Voltage Standard Potential Transformer HJ series (66-500KV)

What does the HJ series potential transformer do?
It measures high voltage in power systems safely. It steps down dangerous voltages like 66kV to 500kV. It gives safe, low-level signals for meters and protection devices. This lets operators monitor voltage accurately.

How accurate is the HJ series?
Its accuracy is very high. It meets strict standards like IEC 61869. Accuracy levels include 0.1, 0.2, and 0.5. This means measurements are reliable for billing and grid control. It keeps working right under different conditions.

Where is the HJ series used?
It is used in substations and power plants. It connects to high voltage transmission lines (66kV to 500kV). It feeds voltage data to meters, relays, and control systems. It is essential for safe grid operation.

Does the HJ series need special maintenance?
It needs very little maintenance. Its sealed design protects internal parts. Check the insulation oil condition regularly. Keep the bushings clean. Follow the manufacturer’s schedule for inspections.

Is the HJ series safe?
Yes, safety is critical. It has strong insulation and grounding. It prevents high voltage from reaching the low-voltage side. It withstands lightning strikes and switching surges. Proper installation ensures operator and equipment safety.