The HCKC-2002 Power transformer On-Load Tap Changer (OLTC) Tester is a comprehensive measurement instrument designed to assess and analyze the electrical performance parameters of OLTCs in power transformers and specialized transformers within power systems. Utilizing computer control and a specially designed measurement circuit, the device enables the precise measurement of various parameters, including transition time, transition waveforms, transition resistance, and three-phase synchronicity. Depending on specific requirements and on-site conditions, users can perform measurements either directly via the tap changer leads or by connecting directly to the transformer's three-phase bushings and neutral point.

The instrument features capabilities for data analysis, storage, and printing. It effectively resolves the current issues regarding outdated measurement methods and the lack of specialized testing equipment for power transformer OLTCs. By enabling the timely diagnosis of potential faults within OLTCs during preventive maintenance and major transformer overhauls, this instrument plays a crucial role in enhancing the operational reliability of power systems.

Product Features

The LHTKC-2002 Power Transformer OLTC Tester offers the following key advantages:

Light-Beam Oscilloscope Functionality:

The instrument features three independent channels capable of simultaneously recording data for the A, B, and C phases. It automatically captures and displays the dynamic processes—specifically the transition resistance and time-domain fluctuations—that occur during the tap-changing operation. Unaffected by weather conditions, its performance capabilities far exceed those of traditional light-beam oscilloscopes.

Comprehensive Measurement Capabilities:

A single instrument allows for the measurement of a wide array of OLTC parameters. These include the status of switch selection, the detection of any open-circuit points throughout the entire switching cycle, transition waveforms, transition time, transition resistance, and three-phase synchronicity. By utilizing the dedicated function keys, users can perform detailed analyses of the waveforms to determine the specific time durations and resistance values within various segments of the transition process.

-- Print Output:The instrument is equipped with a high-speed, panel-mounted printer featuring a convenient front-loading paper mechanism.

-- Excellent Anti-Interference Performance:

Housed in a full aluminum-alloy chassis and internally equipped with power noise filters and anti-interference circuitry, the instrument ensures reliable measurement performance even in challenging field environments characterized by poor power quality and strong electromagnetic interference.

-- Data Retention and Communication:

All measurement data and waveforms captured by the user can be securely stored within the instrument's internal memory. Up to 128 sets of waveforms can be stored in memory; these data are retained even in the event of a power failure. Test results recorded in the field can be transferred to a computer for permanent storage via a serial port using a dedicated data cable. (Dedicated software is provided by the manufacturer.)

Technical Specifications

1. Three independent test power sources; maximum output current: 0.5A.

2. Configurable sampling rate: 10–20 kHz.

3. Maximum storage duration for a single waveform: 6.4 seconds.

4. Transition resistance measurement range: 1–40 Ω for Y/0-type transformers; 1–20 Ω for Y-type transformers.

5. Measurement accuracy: Δ ≤ ±10% for 1–5 Ω; Δ ≤ ±5% for 5–40 Ω. Time measurement error: Δ ≤ ±1%.

6. Display: 240 × 128 dot-matrix LCD with T6963C controller.

7. Processing Unit: High-speed 8-bit microprocessor; 512 KB data memory; capable of storing up to 128 sets of waveforms.

8. High-speed A/D converter with a maximum sampling rate of 400 kHz.

9. Power Supply: 220 V ±10%; Power Consumption: ≤200 W.

10. Dimensions: 410 mm × 320 mm × 200 mm.

11. Weight: ≤20 kg.