Shanxi Dingtaishun Coal Machinery purchases DEMIKS transformer comprehensive testing benches to strengthen its electrical safety testing capabilities in the mining industry.
Rezumat știri
Recently, DEMIKS high-voltage power testing equipment and Shanxi Dingtaishun Coal Machinery Equipment Manufacturing Co., Ltd. reached a deep cooperation agreement. Shanxi Dingtaishun Coal Machinery officially purchased DEMIKS fully automatic transformer comprehensive testing benches for use in mine explosion-proof dry-type transformers, mobile substations for factory coal safety MA certification testing, maintenance and repair inspections, and insulation performance testing of semi-finished products. This article details the core application value of the DEMIKS transformer comprehensive testing bench in the coal machinery manufacturing industry. It also outlines all equipment categories in the coal mine electrical industry chain that require high-voltage power testing equipment, including mine substations, high-voltage switches, instrument transformers, cables, and surge arresters.
Published: July 9, 2026 Source: DEMIKS Power
Tags: #Transformer Comprehensive Test Bench #Mining Transformer Testing Equipment #Coal Mine High Voltage Testing Equipment #Mining Mobile Substation Withstand Voltage Test #MA Coal Mine Safety Certification Testing Instruments #DEMIKS High Voltage Power Testing Equipment #Coal Mine Electrical Comprehensive Test Bench
I. Good News of Cooperation: Shanxi Dingtai Shun Coal Machinery Signs Agreement to Purchase DEMIKS Transformer Integrated Test Bench, Deepening its Footprint in the Shanxi-Shaanxi Coal Machinery Manufacturing Market
Recently, DEMIKS, a manufacturer of high-voltage power testing equipment in China, announced a significant cooperation agreement. Shanxi Dingtaishun Coal Machinery Equipment Manufacturing Co., Ltd. has signed a purchase agreement for a DEMIKS fully automatic transformer integrated testing platform. The complete set of testing equipment is about to complete production, delivery, on-site installation and commissioning, and full-process operation training, and will be officially put into use in the company’s mining electrical product testing workshop. This cooperation is a landmark project for DEMIKS in its deep cultivation of the Shanxi coal mining equipment manufacturing sector, further consolidating DEMIKS’ market share in the field of coal machinery manufacturing and mining explosion-proof electrical testing equipment in North China, and providing one-stop high-voltage testing solutions for hundreds of coal machinery equipment manufacturers and mining transformer manufacturers in Shanxi, Shaanxi and Inner Mongolia.
Shanxi Dingtaishun Coal Machinery Equipment Manufacturing Co., Ltd., rooted in the core coal-producing area of Shanxi, is a key coal machinery enterprise in the region specializing in the research, development, production, and maintenance of explosion-proof dry-type transformers for mining, mobile substations for mining, underground high-voltage complete sets of electrical control systems, and explosion-proof switches. Its products are widely supplied to underground mining faces and central substations of large coal groups such as China Coal, Jineng, and Jiao Coal. All mining electrical equipment leaving the factory must strictly comply with relevant coal mine electrical standards (MT/T and GB/T) and obtain MA coal safety mark certification before being put into use in underground coal mines. Underground coal mines are high-risk environments with explosive gas and coal dust. Insulation breakdown, internal short circuits, and leakage discharge of electrical equipment can easily lead to major safety accidents such as gas explosions and underground fires. Therefore, complete, high-precision, fully automatic transformer comprehensive testing benches are essential core testing equipment for coal machinery manufacturers and are also mandatory equipment for annual factory audits and product type testing at the safety mark center.
During the initial equipment selection phase, the technical team at Shanxi Dingtaishun Coal Machinery conducted on-site comparative tests on transformer integrated test benches from several domestic high-voltage testing equipment manufacturers. The tests focused on six core dimensions: testing accuracy, integrated functionality, automated operation, compatibility with mining transformers, automatic generation of coal mine safety reports, stability under harsh workshop conditions, and full-cycle after-sales service. After comprehensive comparative testing of no-load loss, load loss, DC resistance, transformer ratio group, power frequency withstand voltage, third harmonic induced withstand voltage, insulation resistance, and absorption ratio, the DEMIKS transformer integrated test bench stood out with its core advantages: 0.2-level high-precision measurement, integrated design eliminating the need for multiple instruments, intelligent software automatically generating test reports compliant with coal mine safety certification standards, dust proof and moisture-proof industrial cabinet design, and compatibility with the testing of all 6kV/10kV series mining dry-type transformers. This allowed it to successfully secure the procurement order.
The head of Shanxi Dingtaishun Coal Machinery Equipment stated, “Electrical safety in coal mines is paramount. Factory testing of mine-use mobile substations and explosion-proof transformers allows for no data errors. Traditional split-type high-voltage testing instruments are cumbersome to operate, time-consuming with multiple devices connected, and prone to errors during manual data recording, failing to meet our needs for large-scale transformer factory testing. The DEMIKS Transformer Comprehensive Testing Platform provides a one-stop solution for all routine transformer tests, boasting a high degree of automation, stable and reliable test data, and standardized test reports that can be directly used for MA coal mine safety certification applications. Furthermore, the equipment can handle three major scenarios: new product factory testing, re-inspection of transformers returned for repair, and semi-finished product insulation sampling testing, significantly improving the testing efficiency of our quality inspection workshop and the product qualification rate, thus mitigating underground electrical safety hazards from the source. Considering the equipment’s performance, industry compatibility cases, technical training, and after-sales support, we ultimately chose to establish a long-term partnership with DEMIKS.”
II. Four Core Uses of DEMIKS Transformer Comprehensive Testing Bench Purchased by Shanxi Dingtai Shunmei Machinery (Intensive SEO Keyword Layout in the Industry)
(I) Mandatory Coal Mine Safety Testing (MA) for Explosion-proof Transformers and Mobile Substations Used in Mining (Core Essential Scenarios)
The DEMIKS Transformer Comprehensive Test Bench is an integrated core device for coal mining machinery manufacturers to complete routine factory tests on mining transformers. It fully covers all test items required by the GB/T 8286 and MT/T 1099 coal safety inspection standards, and completes the following in one stop: winding DC resistance test, turns ratio and connection group verification, no-load loss/no-load current test, load loss and impedance voltage detection, power frequency withstand voltage test, third harmonic induced withstand voltage test, and insulation resistance and absorption ratio measurement.
DC resistance test: Quickly identify defects such as poor coil soldering, broken windings, and poor terminal contact, and prevent local overheating and fire during equipment operation underground;
Transformer ratio group test: Verify the winding process to ensure that the output voltage matches the underground loads such as coal mining machines, scraper conveyors, and belt conveyors;
No-load loss detection: Determines whether the core lamination and insulation impregnation processes meet the standards, controls the transformer’s operating temperature rise and energy consumption, and ensures long-term load operation without failure;
Power frequency withstand voltage and third harmonic frequency induction withstand voltage (high voltage core test items): Simulate the extreme working conditions of high humidity, dust and frequent load fluctuations in underground mines, and conduct high-intensity tests on the insulation withstand capability of windings to prevent insulation breakdown from generating electric sparks that ignite methane. It is the most critical safety test procedure for explosion-proof electrical equipment in coal mines.
Automatic data storage and printing of standardized test reports: The reports include complete test curves, environmental parameters, and equipment numbers, serving as legal documents for MA coal mine safety mark certification, product qualification certificates, and factory release, meeting the mandatory requirements of the National Mining Product Safety Mark Center for on-site factory audits.
(ii) Re-inspection of faulty transformers returned to the factory for repair in coal mines
Shanxi Dingtai Shun Coal Machinery Co., Ltd. undertakes major repair and maintenance services for damaged mobile substations and explosion-proof dry-type transformers in coal mines. The DEMIKS transformer comprehensive testing platform covers the entire repair process: before repair, it quickly locates winding breakdown, core damage, and tap changer faults through withstand voltage, insulation, and resistance testing; after coil rewinding, insulation replacement, and sealing overhaul, it performs a full set of high-voltage retests to confirm that insulation performance and electrical parameters have returned to factory standards, and issues a repair qualification test report. Only then can the coal mine put the equipment back into the mine for power supply, avoiding underground safety risks caused by substandard repair quality.
(III) Sampling and quality inspection of incoming materials including iron cores, magnet wires, insulating boards, and semi-finished tap changers
The insulation quality of the core raw materials for transformers purchased by enterprises directly determines the safety performance of the entire machine. By using the DEMIKS transformer comprehensive test bench to conduct high-voltage sampling tests on semi-finished products, unqualified raw materials with damp insulation, substandard material withstand voltage, and excessive conductor resistance deviation can be intercepted in advance. This avoids rework and repair after the entire machine is assembled, significantly reduces production material loss, shortens the production cycle, and optimizes the enterprise’s production cost control.
(iv) Proactive risk management to avoid major underground safety accidents and corporate safety supervision penalties.
The Coal Industry Safety Supervision Regulations clearly require that all underground high-voltage electrical equipment leaving the factory must have complete high-voltage test qualification records, and products without compliant test reports are strictly prohibited from entering the coal mine market. The DEMIKS fully automatic transformer comprehensive testing bench standardizes the testing process and ensures data traceability, eliminating potential hazards such as leakage, short circuits, and insulation damage from the source of production. This prevents major safety accidents such as gas explosions and underground electrical fires, helping coal machinery manufacturers avoid multiple operational risks, including hefty penalties from safety supervision departments, mine shutdowns and claims, and damage to brand reputation.
III. The entire industrial chain of coal mining machinery manufacturing requires a full range of electrical equipment, including high-voltage power testing equipment.
The working conditions in coal mines are unique, with multiple harsh conditions such as gas, coal dust, humidity, and particulate matter overlapping. All high-voltage and explosion-proof electrical equipment used underground must undergo insulation, electrical parameter, and withstand voltage testing using high-voltage power testing equipment before leaving the factory, undergoing maintenance, and being put into storage. Based on DEMIKS’ industry experience serving hundreds of coal machinery manufacturers and coal mine electromechanical repair workshops nationwide, we have compiled a comprehensive list of high-voltage testing instruments required in the coal machinery industry, including transformer comprehensive test benches, power frequency withstand voltage devices, loop resistance testers, descărcare parțială detectors, instrument transformer comprehensive testers, and DC high-voltage generators, covering the entire product line of coal machinery manufacturing.
(I) Mining substations (Shanxi Dingtai Shun Coal Machinery’s main core products, compatible with DEMIKS transformer integrated test bench)
Explosion-proof dry-type transformer for mining (6kV/10kV mobile substation main transformer): complete set of DC resistance, turns ratio, no-load, power frequency withstand voltage, induced withstand voltage, and insulation tests;
Complete set of explosion-proof mobile substation equipment for mining: In addition to the main transformer body, the high-voltage load switch and low-voltage feeder unit are equipped with insulation withstand voltage and conductive circuit resistance testing. Mining dry-type smoothing reactors and current-limiting reactors: DC resistance, AC withstand voltage, and loss characteristics testing.
(ii) Complete sets of underground high-voltage switchgear (standard testing items for coal mining machinery plants)
PJG series explosion-proof high-voltage vacuum power distribution equipment for mining (6kV/10kV).
Underground high-voltage vacuum circuit breakers, permanent magnet high-voltage switches, and disconnect switches; Supporting testing items: main circuit power frequency withstand voltage, conductive circuit resistance, opening and closing synchronization characteristics, break withstand voltage, and relay protection group test.
(III) High-voltage current and voltage transformers (CT/PT) for mining
Mobile substations and high-voltage switch-gear have built-in instrument transformers, which require the use of an instrument transformer comprehensive tester in conjunction with high-voltage equipment to complete the following tests: transformer ratio, polarity, volt-ampere characteristics, partial discharge, and insulation withstand voltage.
(iv) Accessories for high-voltage power cables and explosion-proof cables used in mining
MYJV and MYJV22 series 6/10kV mining high-voltage cables, cable terminals, and intermediate explosion-proof joints; insulation resistance, DC withstand voltage, and leakage current tests are conducted using a DC high-voltage generator and tester rezistenta izolatiei.
(v) Over-voltage protection and lightning protection equipment for mining: zinc oxide surge arresters
underground substation is equipped with surge arresters as standard. The testing items include insulation resistance, 0.75U1mA leakage current, power frequency discharge test, and a surge arrester characteristic tester.
(vi) Explosion-proof electrical control equipment for underground high and low voltage
Low-voltage explosion-proof power supply switch and magnetic starter (for use with coal mining machine, scraper conveyor and belt conveyor);
Downhole multi-circuit combination switch, intrinsically safe integrated protection device; Testing content: power frequency withstand voltage of control circuit, leakage current interlocking protection, and overload/short circuit protection action parameter verification.
(vii) Other underground high-voltage electrical equipment
Mining explosion-proof high-voltage drive motors (main conveyor belts, underground water pump high-voltage motors): stator winding DC resistance, insulation resistance, AC withstand voltage test;
Downhole high-voltage charging device and isolated power supply module;
The entire grounding system of the underground central substation is equipped with a grounding resistance tester to conduct grounding safety testing.
IV. DEMIKS focuses on the high-voltage testing of mining electrical equipment, creating an integrated testing solution specifically for the coal mining machinery industry.
As a professional brand specializing in the R&D, production, sales, and technical services of high-voltage power testing equipment, DEMIKS has long focused on the testing of power transformers, mine explosion-proof electrical equipment, rail transit traction transformers, and high and low voltage switchgear. Its core products include a full range of high-voltage testing equipment such as fully automatic transformer comprehensive test benches, power frequency withstand voltage test devices, triple frequency induction withstand voltage generators, partial discharge detectors, instrument transformer comprehensive testers, series resonant withstand voltage systems, DC high-voltage generators, and loop resistance testers. These products are fully compatible with the testing needs of various scenarios in power equipment manufacturers, coal mining machinery manufacturers, rail transit equipment manufacturers, coal mine electromechanical maintenance workshops, and power supply company testing centers.
Addressing the specific testing needs of mining transformers in the coal mining machinery industry, DEMIKS has made several customized upgrades and optimizations to its comprehensive transformer test bench: the entire machine adopts a thickened, sealed industrial cabinet, which is dustproof and moisture-proof, suitable for the dusty and high-humidity production environment of coal mining workshops; it has built-in dedicated testing software for mining transformers, preset MT coal safety standard test templates, and can start a full set of routine tests with one click; it supports full coverage testing of 630kVA-8000kVA 6kV/10kV mining dry-type transformers; it is equipped with multiple overvoltage, overcurrent, and short-circuit safety protections, and the high-voltage test process is completely isolated from the machine to ensure the safety of quality inspectors; the equipment comes with a complete set of test report templates required for coal safety certification, which can be submitted directly to the safety certification center without secondary editing by the enterprise.
In addition to hardware delivery, DEMIKS provides a one-stop solution for all coal mining machinery industry customers: on-site installation and commissioning, 72 hours of hands-on training by engineers, annual equipment calibration, lifetime free software upgrades, and 24-hour nationwide technical after-sales support. This addresses the industry pain points of coal mining machinery companies, such as difficulty in operation, maintenance, and calibration after purchasing high-voltage testing equipment. As of 2026, DEMIKS has served over 200 coal mining equipment manufacturers and mining electrical equipment suppliers in Shanxi, Shaanxi, Inner Mongolia, Henan, and Shandong provinces, making it a highly recognized supplier of high-voltage testing equipment in the North China coal mining equipment manufacturing sector.
V. Industry Development Outlook: Standardization Upgrades in Mining Electrical Testing; DEMIKS Continues to Support Safe Mine Production
With the continuous strengthening of national coal mine safety supervision and the tightening of MA coal mine safety certification standards, the standardization, automation, and integration of factory testing and periodic maintenance tests for underground electrical equipment in coal mines have become an inevitable trend in the industry. The past practice of coal machinery plants purchasing single-function withstand voltage testers, DC resistance testers, and transformer ratio testers in a decentralized manner has shortcomings such as numerous devices, cumbersome wiring, large human error, and inconsistent test reports. Integrated, fully automatic transformer comprehensive testing benches are rapidly replacing traditional split-type testing solutions and have become the preferred equipment for newly built and expanded coal machinery quality inspection workshops.
This successful collaboration with Shanxi Dingtaishun Coal Machinery marks a significant milestone for DEMIKS in its efforts to cultivate the Shanxi coal machinery market. Moving forward, DEMIKS will continue to increase its investment in the research and development of explosion-proof electrical testing technologies for mining applications. It will develop a new generation of intelligent integrated testing systems for large-capacity mobile substations and intelligent underground high-voltage complete sets of equipment. Simultaneously, DEMIKS will expand its localized technical service network in the Shanxi, Shaanxi, and Inner Mongolia coal-producing areas, providing more coal machinery manufacturers and coal mine maintenance units with high-precision, high-stability, and highly adaptable complete high-voltage power testing solutions. By using professional testing equipment, DEMIKS aims to strengthen the electrical safety defenses in coal mines and contribute to the high-quality development of safe production in the coal industry.
Despre DEMIKS
DEMIKS has focused on the R&D and manufacturing of high-voltage power testing instruments for over ten years. Its main products include transformer comprehensive test benches, power frequency withstand voltage devices, partial discharge detectors, series resonant test equipment, instrument transformer calibrators, and DC high-voltage generators. These products are widely used in mining electrical manufacturing, power transformer factories, rail transit equipment, high and low voltage switchgear factories, power grid companies, and third-party power testing institutions. The company possesses a complete independent R&D, production, and quality inspection system. Its products have passed multiple authoritative metrological certifications, and it supports customized chemical condition adaptation modifications. DEMIKS provides integrated services including equipment installation, practical training, and lifetime after-sales support, committed to providing one-stop high-voltage performance testing solutions for the industrial electrical manufacturing industry.
