---
description: Shanghai Demiks Power Technology Co., Ltd. has finished delivery, on-site commissioning and operator training of a full set of high voltage test instruments
title: Demiks Power Delivers High-Voltage Test Equipment to Hunan Changgao Senyuan to Support HV Switch-gear Inspection - DEMIKS
image: https://demikspower.com/wp-content/uploads/2026/09/Lighting-Impulse-Voltage-Generator-768x1024.jpg
---

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# Demiks Power Delivers High-Voltage Test Equipment to Hunan Changgao Senyuan to Support HV Switch-gear Inspection

- [by Demiks](https://demikspower.com/author/demiks/)
- [on September 20, 2026](https://demikspower.com/blog/2026/09/20/)
- [No Comments](https://demikspower.com/blog/demiks-power-delivers-high-voltage-test-equipment-to-hunan-changgao-senyuan-to-support-hv-switch-gear-inspection/#respond)

**Shanghai Demiks Power Technology Co., Ltd.** has finished delivery, on-site commissioning and operator training of a full set of [high voltage test instruments](https://demikspower.com/high-voltage-test-equipment/) for Hunan Changgao Senyuan Electric Equipment Co., Ltd. The supplied equipment includes [switch-gear power-on test bench](https://demikspower.com/switchgear-test-equipment/), high-current temperature rise test system, DC high voltage generator, [power frequency withstand voltage test transformer system](https://demikspower.com/high-voltage-test-equipment/power-frequency-voltage-withstand-device/) and transformer comprehensive tester. These testing instruments fully cover routine factory tests for high voltage switchgears, current transformers and voltage transformers.

**Contents** show

[1 Required Test Items & Matching High Voltage Test Equipment](#Required_Test_Items_Matching_High_Voltage_Test_Equipment)

[1.1 1. High Voltage Switchgear (MV switchgear, Ring Main Unit)](#1_High_Voltage_Switchgear_MV_switchgear_Ring_Main_Unit)

[1.2 2. Instrument Transformers (CT & PT)](#2_Instrument_Transformers_CT_PT)

[2 Introduction of Core Test Equipment](#Introduction_of_Core_Test_Equipment)

[3 About Demiks Power](#About_Demiks_Power)

Hunan Changgao Senyuan manufactures medium & high voltage switchgears, gas insulated RMUs, CT and PT instrument transformers. All electrical apparatus must pass strict insulation and performance tests before delivery. With Demiks complete high voltage testing solutions, Changgao Senyuan can carry out all core tests in-house, shorten delivery cycle and reduce third-party testing expenses.

## ****Required Test Items & Matching High Voltage Test Equipment****

### ****1. High Voltage Switchgear (MV switchgear, Ring Main Unit)****

**Switchgear Power-on Test for Secondary Circuit** Equipment: **HV Switchgear Power-on Test Bench** Function: Verify secondary control circuit, circuit breaker switching operation, mechanical interlock and five-prevention interlock logic; eliminate wiring faults and mechanism failures. Mandatory routine test before factory shipment.

**Power Frequency AC Withstand Voltage Test** Equipment: **Power Frequency Withstand Voltage Transformer System** Function: Apply AC high voltage to main circuit to check insulation strength between phases and to earth, detect insulation defects of busbars, insulators and enclosures.

**Temperature Rise Test** Equipment: **High Current Temperature Rise Test System** Function: Inject rated continuous current into primary circuit, monitor temperature of contacts and bus connections to avoid overheating during long-term operation.

**[Partial Discharge Test](https://demikspower.com/blog/what-is-partial-discharge-test/) (Type Test Option)** Matched with PD shielding room and partial discharge test system, detect internal defects of gas tank and solid insulation synchronously during AC withstand voltage test.

![High Voltage Switchgear](https://demikspower.com/wp-content/uploads/2026/09/IMG_20230323_150749-225x300.jpg)  ![Temperature Rise Test Equipment](https://demikspower.com/wp-content/uploads/2026/09/IMG_20230323_154010-225x300.jpg) ![Lighting Impulse Voltage Generator](https://demikspower.com/wp-content/uploads/2026/09/Lighting-Impulse-Voltage-Generator-225x300.jpg)

### ****2. Instrument Transformers (CT & PT)****

**Transformer Comprehensive Characteristic Test** Equipment: **CT PT Comprehensive Tester** Function: Test transformation ratio, polarity, winding resistance, excitation curve to guarantee measurement & protection accuracy.

**DC Withstand Voltage & Leakage Current Test** Equipment: **DC High Voltage Generator** Function: Detect insulation dampness and internal cracks by measuring leakage current under DC high voltage.

**Power Frequency Withstand Voltage Test** Equipment: **Power Frequency HV [Test Transformer](https://demikspower.com/blog/test-transformer/) System** Verify insulation between primary winding, secondary winding and earth, complying with IEC & GB standards for instrument transformers.

## ****![Power Frequency AC Withstand Voltage Test](https://demikspower.com/wp-content/uploads/2026/09/70d999873516cf6225141e1c2af715d-225x300.jpg)****

## ****Introduction of Core Test Equipment****

**HV Switchgear Power-on Test Bench** Integrated power supply and control unit for secondary circuit simulation test of medium voltage switchgear and RMU, realize automatic switching and interlock function verification efficiently.

1. **High Current Temperature Rise Test System**Adjustable three-phase constant current source with multi-channel temperature acquisition module, meeting GB/T 11022 temperature rise test standard for high voltage switchgear assemblies.
2. **Power Frequency Withstand Voltage Transformer System**Consists of testing transformer, intelligent control console, protective resistor and voltage divider, widely used for AC [hipot test](https://demikspower.com/blog/hipot-test/) of switchgears, transformers, cables and insulators. [Partial discharge](https://demikspower.com/blog/partial-discharge/) free version is optional.
3. **Portable DC High Voltage Generator**Applied to DC withstand voltage and leakage current measurement of transformers, surge arresters and power cables, equipped with complete safety protection.
4. **CT PT Comprehensive Tester**All-in-one testing device for instrument transformers, automatically record test data and generate formal test reports, suitable for mass production inspection.

## ****About Demiks Power****

Shanghai Demiks Power Technology Co., Ltd. develops and manufactures high voltage testing equipment, including partial discharge detection system, PD shielding room EPC project, AC withstand voltage test set, DC high voltage generator, temperature rise test system, series resonance test equipment and lightning impulse test system. We provide one-stop high voltage laboratory solutions for high voltage equipment manufacturers and power testing institutions.

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I share updates on DEMIKS high voltage testing projects and the equipment selected for particular applications. My articles cover customer test systems, including impulse voltage, temperature rise, and partial discharge testing, so readers can see the testing needs behind each project and the solutions being discussed.

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- [DC Withstand Voltage & Leakage Current Test](https://demikspower.com/blog/tag/dc-withstand-voltage-leakage-current-test/), [Power Frequency AC Withstand Voltage Test](https://demikspower.com/blog/tag/power-frequency-ac-withstand-voltage-test/), [Temperature Rise Test Equipment](https://demikspower.com/blog/tag/temperature-rise-test-equipment/)

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