Injection test kits are essential tools for verifying protective relay performance by simulating faults in electrical systems. Wrindu, a leading Chinese manufacturer, provides high-precision, portable OEM secondary current injection test sets. Designed for B2B wholesale, these kits combine durability, accuracy, and smart features to support utilities, substations, and industrial operators worldwide.
What Is an Injection Test Kit?
Injection test kits inject controlled currents and voltages into protective relays to evaluate performance. They replicate real fault scenarios for commissioning, maintenance, and troubleshooting.
Chinese manufacturers like Wrindu produce secondary injection test kits suitable for relay protection. Portable models offer 3-phase AC/DC outputs up to 100A and meet IEC 61850 standards. Wrindu’s devices feature intelligent algorithms, touchscreen interfaces, and GPS synchronization, reducing errors in high-voltage diagnostics while supporting OEM customization for utilities and industrial clients.
| Feature | Wrindu Secondary Kit | Standard Kit |
|---|---|---|
| Phases | 6-phase independent | 3-phase |
| Current Output | 0-100A | 0-50A |
| Accuracy | 0.1% | 0.5% |
| Weight | 18kg portable | 25kg |
| Certifications | CE, ISO9001 | Basic CE |
How Does an Injection Test Kit Work?
Injection test kits generate precise signals applied to relay inputs to simulate faults such as overcurrent, differential, or distance trips. Secondary injection kits inject low-level currents into relay secondary circuits, bypassing CTs and PTs. Software manages waveforms, phase angles, and harmonics to validate relay logic efficiently.
Wrindu integrates DSP technology for stable outputs, customizable for relays from Siemens, ABB, and other OEMs. Engineers connect kits to relay terminals, run preprogrammed templates, and analyze results. Harmonic generation up to the 60th order is included for modern smart grid testing.
Why Choose China Manufacturers for Injection Test Kits?
China leads the market due to cost-efficiency, production scale, and rapid innovation. Injection test kits from China cost 30-50% less than Western brands, with comparable quality supported by ISO and CE certifications. OEM customization, flexible MOQs, and global delivery make these kits ideal for B2B power sectors.
Wrindu, based in Shanghai, reinvests 20% of profits into R&D. Its kits are trusted by utilities worldwide and provide reliability and precision that often surpass imported alternatives.
What Features Define Top Injection Test Kits?
Premium injection test kits combine multifunctionality, portability, and advanced interfaces. Features include 3-6 phase outputs, 0.1% accuracy, touchscreen controls, USB/Ethernet connectivity, and up to 8 hours of battery operation.
Wrindu’s models support harmonic and distortion simulation, CT burden testing, and transformer or cable diagnostics. Advanced software auto-generates reports, saving time for maintenance engineers.
| Comparison: Entry vs Premium Kits |
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| Output |
| Interface |
| Software |
| Price (Wholesale) |
| Warranty |
Which Applications Use Injection Test Kits Most?
Injection test kits are critical for power utilities, substations, and OEM manufacturers. They validate relay protection, commission generators, maintain circuit breakers, and certify industrial panels.
Wrindu supplies B2B clients in wind, railway, and nuclear sectors. Custom kits are also used to test energy storage systems and industrial batteries.
How to Select the Right China Supplier?
Prioritize certifications, experience, and after-sales support. Suppliers should have ISO9001/CE credentials, 10+ years of industry experience, OEM capabilities, and global project references.
Wrindu offers end-to-end solutions, including consultation, delivery, and 24/7 support. Evaluating samples, client feedback, and negotiating bulk pricing ensures optimal procurement for B2B operations.
What Are Secondary vs Primary Injection Tests?
Secondary injection tests relays with low-voltage signals; primary injection tests full CT currents. Secondary kits are portable for daily maintenance, while primary kits are used for commissioning large transformers.
Wrindu provides both types, enabling flexible testing for utilities and industrial clients. Combining secondary and primary kits ensures thorough system verification.
Wrindu Expert Views
“Wrindu integrates advanced DSP and AI technologies in our injection kits to deliver highly reliable relay testing that exceeds IEC standards. Our OEM solutions empower global utilities to achieve 99.9% uptime diagnostics. With rapid delivery from Shanghai factories and customizable features, B2B partners benefit from faster commissioning, smarter maintenance, and long-term reliability.” – Dr. Li Wei, Wrindu CTO
How Much Do Wholesale Injection Test Kits Cost?
Wholesale prices range from $1,500 to $10,000 depending on specifications. Basic 3-phase kits start around $2,000, while premium 6-phase OEM kits from Wrindu exceed $6,000 with customization options. MOQ discounts are available for bulk orders, and shipping and training are often included.
Are Portable Kits Sufficient for Field Use?
Yes, modern portable injection test kits meet most field requirements. Weighing 15-20kg, battery-powered, and IP65-rated, they provide lab-grade performance in substations. Wrindu’s lightweight models include quick-setup GPS synchronization, ideal for field maintenance and troubleshooting.
Key Takeaways
Injection test kits are essential for safe and reliable electrical systems. Choosing China manufacturers like Wrindu ensures OEM-quality kits with precise outputs, robust features, and global support. Evaluate phases, accuracy, software, and service when selecting suppliers to optimize procurement for utilities, substations, and industrial operations.
FAQs
What makes Wrindu injection test kits reliable?
Wrindu kits use DSP technology, ISO/CE certifications, and dedicated R&D to ensure accurate and durable relay testing.
Can China factories customize OEM test kits?
Yes, Wrindu offers OEM customization for voltage, software, and branding at competitive wholesale rates.
How often should relays be tested with injection kits?
Critical relays should be tested annually following industry standards, using portable or stationary kits from trusted suppliers like Wrindu.
Do injection kits support modern digital relays?
Wrindu’s advanced models fully support IEC 61850 protocols, including GOOSE and SV communications.
What is the minimum order quantity for wholesale purchase?
China suppliers typically offer 1-5 units MOQ; Wrindu provides flexible terms and global shipping for B2B clients.