Outdoor Voltage Transformer

The Usune TYD series Outdoor Voltage Transformer covers all voltage levels from 35kV to 220kV, converting high-voltage systems to 100/√3 V or 100 V standard low-voltage signals to meet the needs of energy metering, voltage measurement, relay protection, and grid synchronization verification. Compared to traditional electromagnetic voltage transformers, this product also features power line carrier communication coupling, avoiding ferroresonance issues. Its overall structure is reliable, ensuring the long-term safe and stable operation of high-voltage power grids, making it a core supporting device for smart grid construction.

Capacitor Voltage Transformer

TYD-35 (66, 110/220)kV-0.01 (0.02)

General Instructions

Product Model Explanation

The TYD series model codes clearly define product parameters and applicable scenarios, facilitating engineering selection and on-site installation. The coding rules are as follows:

1. Model Structure: TYD ① – ② ③

- TYD: Code for capacitive voltage transformer
- ①: Rated phase voltage of the system (unit: kV)
- ②: Rated capacitance of the voltage divider (unit: μF, optional 0.01μF, 0.02μF)
- ③: Functional feature suffix code

2. Suffix Code Explanation:

- H: Pollution-resistant type, suitable for heavily polluted areas
- G: High-altitude type, suitable for areas above 2000m altitude
- F: Suitable for neutral point non-effectively grounded systems

3.Typical Model Example

TYD110/√3-0.02FH, representing a 110kV voltage level, a voltage divider rated capacitance of 0.02μF, suitable for neutral point non-effectively grounded systems and Class D pollution environments, a capacitive voltage transformer.

Core Functions

1.Precise Metering and Voltage Measurement

Enables high-precision voltage acquisition and energy metering, ensuring accurate settlement of power grid consumption data.

2.Power Grid Protection and Automatic Control

Provides stable voltage signals for relay protection, power grid automatic control, and synchronization verification, enabling rapid response to system faults.

3.Power Line Communication Coupling

Acts as a coupling capacitor for power line carrier communication, achieving power line signal transmission without additional wiring.

Execution Standards

The entire production and testing process of the Outdoor Voltage Transformer strictly adheres to national authoritative standards, fully meeting engineering acceptance specifications:
- GB/T20840.1-2010 "Instrument Transformers - Part 1: General Technical Requirements"
- GB/T20840.5-2013 "Instrument Transformers - Part 5: Supplementary Technical Requirements for Capacitive Voltage Transformers"
- GB/T19749-2005 "Coupled Capacitors and Capacitive Voltage Dividers"

Applicable Environmental Conditions

The Outdoor Voltage Transformer boasts excellent environmental adaptability and can operate stably under complex outdoor conditions. Standard applicable parameters are as follows:
- Installation Scenarios: Suitable for both indoor and outdoor use
- Ambient Temperature: -40℃～+45℃ (Special conditions can be customized and negotiated)
- Maximum Wind Speed: ≤150km/h
- Rated Altitude: ≤2000m (G-type high-altitude version adapts to higher altitudes)
- Icing Thickness: ≤10mm
- Anti-pollution rating: Standard Class D (creepage distance ≥ 43.3mm/kV), optional Class E (creepage distance ≥ 53.7mm/kV)

Product Structural Advantages

The Usune TYD series CVT adopts a modular integrated structure, consisting of two core parts: a capacitive voltage divider and an electromagnetic device. The structure is robust and durable:

1.High-strength Capacitive Voltage Divider

Utilizes a high-quality thin-film and capacitor paper composite dielectric. Multiple capacitor elements are connected in series inside the porcelain bushing, vacuum-impregnated with high-quality insulating oil. The fully sealed structure is equipped with an oil compensation device to maintain internal voltage stability, eliminating oil leakage and moisture problems. The bolt assembly structure ensures convenient installation and a secure connection.

2.Integrated Electromagnetic Device

Includes a built-in intermediate transformer, compensating reactor, and fast-saturating reactor damper, all sealed within an oil-filled steel tank. It is pre-assembled with the low-voltage divider before leaving the factory, ensuring complete isolation of the insulating oil system and eliminating mutual interference.

3.Safety Protection Design

Equipped with dedicated damping, grounding, and carrier wave terminals with clear markings. Multiple protective structures effectively prevent safety hazards such as high-voltage leakage and damage to secondary equipment.

Engineering Application Cas

As a high-quality supplier of high-voltage CVT equipment, Usune's TYD series voltage transformers have been successfully applied to a key project in the 110kV urban power grid renovation in Zhoushan, Zhejiang Province. The project selected the classic model TYD110/√3-0.02FH, suitable for the complex operating conditions of the local coastal area with heavy pollution and a non-effectively grounded neutral point.
The original equipment in this substation suffered from unstable voltage measurement and weak anti-interference capabilities. After replacing the CVTs with Usune TYD series CVTs, the equipment has been operating stably for more than 3 years, maintaining accurate metering and stable signal output even in harsh environments such as high humidity, salt spray, and strong winds. This provides reliable support for substation relay protection and carrier communication, effectively improving the reliability of the regional power grid operation, reducing equipment failure rates, and fully verifying the product's excellent weather resistance and pollution resistance performance.

Operation and Maintenance Specifications

1. Core Operating Parameters

- Long-term operation: 1.2 times rated voltage (1.2Un)
- Short-term overload: Can operate for 30 seconds at 1.5Un voltage
- F-type dedicated: Can operate continuously for 8 hours at 1.9Un voltage

2. Daily Maintenance Requirements

- Regularly check the equipment's sealing condition to prevent insulating oil leakage;
- Ensure reliable connection of damping terminals d1 and d2; open-circuit operation is strictly prohibited;
- When not connected to carrier equipment, N and X terminals must be reliably short-circuited;
- Unauthorized disassembly of sealing bolts and oil filling hole sealing structures is prohibited;
- Routine oil sampling and testing of the electromagnetic unit is not required to avoid safety hazards caused by oil level drops.

Product dimensions.

Project Reference

Cas-space Rocket Launch Project

Test Report

FAQ

Q1: What core tests need to be completed before commissioning the Usune TYD series CVT?

Three core tests must be completed according to the DL/T596-1996 standard: First, the capacitance and dielectric loss of the capacitor divider must be tested, with the capacitance value deviating from the nameplate by ≤2% and the dielectric loss tangent ≤0.002. Second, the insulation resistance of the electromagnetic unit must be tested using a 2500V megohmmeter, with the insulation resistance of each terminal to ground ≥500MΩ. Third, the accuracy calibration test requires increasing the angle of the high-voltage leads to reduce stray capacitance interference and ensure measurement accuracy.

Q2: What are the key precautions for on-site installation of the Outdoor Voltage Transformer?

First, the capacitor divider and electromagnetic device are a matching set and must be installed according to the nameplate numbers; they cannot be interchanged arbitrarily. Second, the lifting holes of the electromagnetic unit oil tank must be used for hoisting; lifting the capacitor porcelain sleeve is prohibited to prevent equipment damage. Third, the foundation must be fixed with M20 high-strength bolts, and the overall tilt of the equipment must not exceed 2/1000mm. Fourth, ensure that the X terminal is reliably grounded and the damping terminal is securely connected to avoid equipment damage.

Q3: What scenarios are the H, G, and F suffix models suitable for?

H is the anti-pollution type, suitable for heavily polluted and highly corrosive environments such as coastal areas and industrial mines; G is the high-altitude type, optimized for high-altitude, low-voltage, and low-temperature environments, suitable for areas above 2000m; F is the system-adaptive type, specifically designed for neutral-point non-effectively grounded power systems, with stronger overvoltage tolerance, suitable for special power grid operating conditions.

Factory Strength and Service Guarantee

Zhejiang Usune Electric is a professional high-voltage electrical equipment factory integrating R&D, production, and sales. With years of experience in the high-voltage transformer field, it possesses a complete production system and stringent quality inspection processes. All TYD products have passed national standard testing, ensuring stable performance and high cost-effectiveness. Standardized products and customized solutions can be provided according to different voltage levels, environmental conditions, and power grid requirements, providing reliable high-voltage supporting equipment for global power projects.