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On-Load Tap Changer Tester Transition Resistance 0.3-100Ω 320ms OLTC Analyzer

China On-Load Tap Changer Tester Transition Resistance 0.3-100Ω 320ms OLTC Analyzer

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On-Load Tap Changer Tester Transition Resistance 0.3-100Ω 320ms OLTC Analyzer

MOQ： 1 unit
Price： Negotiable
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Sampling Rate	20kHz
Weight	Main unit 6.15kg; cable box 4.55kg
Power Supply	AC220V±10%, 50±1Hz
Payment Terms	T/T
Model NO.	XHYZ1668T
Test Connections	YN, Y, Delta; with/without winding
Supply Ability	2000 units/year
Delivery Time	5-8 work days
Output Current	1.0A, 0.5A, 0.2A
Customization	Available
Packaging Details	Wooden box
Open Circuit Voltage	24V
Data Storage	500 groups built-in
Warranty	12 Months
Measurement Accuracy	Resistance ±(5% reading ±0.1Ω); Time ±(0.1% reading ±0.2ms)
Working Temperature	-10℃~50℃
Display	7-inch high-brightness LCD
Dimensions	Main unit 360×290×170mm; cable box 360×290×170mm
Transition Resistance Range	0.3Ω~20Ω (1.0A); 5Ω~40Ω (0.5A); 20Ω~100Ω (0.2A)
Working Humidity	≤85%RH
Transition Time Range	0~320ms
Certification	CE/ISO
Model Number	XHYZ1668T
Place of Origin	Xi'an, Shaanxi, China
Brand Name	XZH TEST

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Product Specification


Sampling Rate	20kHz	Weight	Main unit 6.15kg; cable box 4.55kg
Power Supply	AC220V±10%, 50±1Hz	Payment Terms	T/T
Model NO.	XHYZ1668T	Test Connections	YN, Y, Delta; with/without winding
Supply Ability	2000 units/year	Delivery Time	5-8 work days
Output Current	1.0A, 0.5A, 0.2A	Customization	Available
Packaging Details	Wooden box	Open Circuit Voltage	24V
Data Storage	500 groups built-in	Warranty	12 Months
Measurement Accuracy	Resistance ±(5% reading ±0.1Ω); Time ±(0.1% reading ±0.2ms)	Working Temperature	-10℃~50℃
Display	7-inch high-brightness LCD	Dimensions	Main unit 360×290×170mm; cable box 360×290×170mm
Transition Resistance Range	0.3Ω~20Ω (1.0A); 5Ω~40Ω (0.5A); 20Ω~100Ω (0.2A)	Working Humidity	≤85%RH
Transition Time Range	0~320ms	Certification	CE/ISO
Model Number	XHYZ1668T	Place of Origin	Xi'an, Shaanxi, China
Brand Name	XZH TEST
High Light	OLTC analyzer transition resistance tester ，on-load tap changer tester 320ms ，transformer tester with warranty

XHYZ1668T On-Load Tap Changer Tester| Transition Resistance & Waveform Analyzer

The on-load tap changer is the only moving part connected to the transformer circuit, which is why OLTC inspection is taken so seriously. Handover and preventive test procedures for electrical equipment require verification of the tap changer action sequence and switching time. The XHYZ1668T measures the OLTC transition waveform, transition time, instantaneous transition resistance values and three-phase synchronization in one test. With 20kHz sampling, a 7-inch LCD, complete protection circuits and a main unit weighing only 6.15kg, it is the practical choice for engineers who must prove tap changer performance on site and after every overhaul.

Applications & Target Audience: Engineered for substation construction and commissioning contractors, power engineering EPC companies, and transformer overhaul & repair workshops that must verify OLTC action sequence, transition time and transition resistance during handover acceptance tests, after tap-changer maintenance, and before transformers return to service.

Key Specifications

Parameter	Specification
Output Current	1.0A / 0.5A / 0.2A
Transition Resistance Range	0.3Ω ~ 20Ω (1.0A) 5Ω ~ 40Ω (0.5A) 20Ω ~ 100Ω (0.2A)
Transition Time Range	0 ~ 320ms
Open Circuit Voltage	24V
Measurement Accuracy	Transition resistance: ±(5% reading ±0.1Ω) Transition time: ±(0.1% reading ±0.2ms)
Sampling Rate	20kHz
Data Storage	500 groups built-in
Display	7-inch high-brightness LCD
Output Interfaces	High-speed printer, USB port, RS232 serial port
Dimensions	Main unit: 360 × 290 × 170 mm Cable box: 360 × 290 × 170 mm
Weight	Main unit: 6.15kg Cable box: 4.55kg
Ambient Temperature	-10°C ~ +50°C
Ambient Humidity	≤85% RH
Working Power Supply	AC 220V±10%, 50±1Hz

Advanced Features

High output current (1.0A) with a lightweight main unit of only 6.15kg

Tests YN, Y and Delta connected transformers with resistance values displayed directly without conversion

Supports both with-winding and without-winding measurement methods

Waveform display automatically adjusts resistance and time amplitude according to sampled values

Complete protection circuit for high reliability in field use

7-inch high-brightness LCD with clear menu-driven operation for on-site work

Built-in storage for 500 groups of test data with query and print functions

High-speed built-in printer plus USB and RS232 interfaces for data export

20kHz high-speed sampling captures every detail of the OLTC switching waveform

Waveform analysis identifies typical OLTC defects such as slow operating mechanisms, broken transition resistors and loose connections

Automatic waveform evaluation with manual cursor-based verification for printing and reporting

Waveform Diagnosis: Typical OLTC Fault Patterns

The XHYZ1668T records the complete switching waveform so that engineers can judge the health of the tap changer, not just pass or fail a resistance reading. The instrument evaluates the following waveform parameters:

R0	Coil resistance plus test lead resistance
R1 / R2	Transition resistor 1 / transition resistor 2
T0	Three-phase synchronization (referenced to the first detected phase)
T1 / T3	Running time of transition resistor 1 / transition resistor 2
T2	Bridge time
T4	Total transition time

Typical fault patterns detected by waveform analysis:

Slow mechanism (spring aging): pre-bridge time extends to about 50ms on all three phases, roughly three times normal, indicating a tired quick-action spring that must be replaced.

Broken transition resistor: a symmetric zero-crossing segment appears on the odd-number side with resistance reading above 50Ω, which can be treated as an open circuit.

Measurement oscillation: waveform oscillation caused by excessive trigger sensitivity on the inductance-increasing direction; reduce sensitivity and re-test from the 1-n direction.

Broken strands in the selector lead: messy waveform with transition resistance as low as 0.3-0.5Ω across all taps, caused by a partially broken flexible connection shorting the transition resistor.

FAQ

Q1: Who is the XHYZ1668T on-load tap changer tester designed for?

It is designed for substation commissioning contractors, power engineering companies and transformer overhaul workshops that perform handover acceptance tests and post-repair verification of on-load tap changers on power transformers.

Q2: Which tests does it support for handover acceptance?

It checks the OLTC action sequence, measures transition waveform, transition time, instantaneous transition resistance of each phase and three-phase synchronization, covering the tap changer items required by handover and preventive test procedures.

Q3: Which transformer connections can be tested?

YN, Y and Delta connected transformers can be tested with or without winding. For Y-connected transformers whose neutral is not led out, and for Delta windings, two-phase or single-phase methods with built-in resistance conversion formulas are provided.

Q4: How does waveform analysis help after an OLTC overhaul?

After repair, the waveform verifies that transition resistors, quick-action springs and selector contacts work correctly. Abnormal patterns such as extended bridge time, open transition resistors or shorted resistors are clearly visible, so the workshop can confirm the repair before the transformer returns to service.

Q5: What is included in delivery and after-sales service?

Each set includes the main unit, cable box with complete test leads, power cable, ground wire, fuses, printer paper and a user manual, packed in a wooden box. Delivery takes 5-8 working days, with a 12-month warranty and lifetime technical support.

Company Details

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Business Type:

Manufacturer 
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Year Established:

2013 
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Total Annual:

1000000-5000000
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Employee Number:

50~100 
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Ecer Certification：

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Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. Has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical... Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. Has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical...

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Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
Building B8-01, Phase I, Ronghao Industrial City, No. 2098, Weiyang 9th Road, Gaoling District, Xi'an, China
https://www.xzhtest.com/

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