Making Protection Testing Safer and More Efficient

TonyZhang
Oct 8
3 min read

During protection testing and calibration, engineers frequently operate CT, PT, control power, and trip circuits—each a potential source of error or risk. Traditional manual procedures, guided by operation tickets and lockout protocols, remain cumbersome and vulnerable to:

⚠️ CT open-circuit risk – overvoltage on the secondary side.
⚠️ PT short or false trip – causing disturbances in the system.
⚠️ Incomplete restoration – leading to false protection operations.
⚠️ Multi-person dependency – low efficiency and increased human error.

This is why the Testblock (test terminal block) has become standard practice in international power projects: it provides a structured, fail-safe way to isolate and test critical secondary circuits.

The Logic Behind Testblock Design

The Testblock was built on one central philosophy—turning complex procedures into a repeatable engineering standard.

Modular interface – replaces manual isolation and reconnection with a unified plug-in system.
Plug to test – inserting the test plug automatically performs all switching required by the test procedure, eliminating repeated manual rewiring.
Unplug to restore – removing the plug immediately restores the normal running state.
Built-in CT self-shorting – ensures secondary circuit safety even during isolation or connection transitions.

With this logic, testing evolves from experience-based to standardized engineering control. The operator no longer worries about missing a step—one interface ensures fast, safe, and repeatable operations.

Our Innovation — TSB-14 Protection Testblock

Building on that foundation, we developed the TSB-14 series protection testblock, engineered for both safety and efficiency:

✅ 14 parallel circuits – covering complete protection test requirements.
✅ 20 A rated current – suitable for most CT and control circuits.
✅ Automatic CT self-shorting – circuit remains closed during operation to prevent CT secondary open-circuit risk.
✅ Anti-vibration open-circuit protection – patented design prevents transient openings caused by connector movement.
✅ Single-person operation – plug-and-test design improves efficiency by 50 %.
✅ Unified interface standard – compatible with all test modules, simplifying accessory management.

The TSB-14 is CE certified and deployed across multiple overseas projects, where clients report testing efficiency gains exceeding 30 %.

Value for Different Users

🌍 For International Customers: If you already use Testblocks, the TSB-14 adds new safety layers through improved CT self-shorting and vibration protection—enhancing security without changing your workflow.

🇨🇳 For Domestic Customers: Widespread adoption of Testblocks proves that modular, standardized testing is the future. The TSB-14 retains this proven concept while introducing localized safety refinements, allowing engineers to test with greater confidence and speed.

Safety and Efficiency, No Longer a Trade-off

The TSB-14 makes protection testing both safer and faster:

Faster operation – plug in to test, unplug to restore; efficiency improved by 50 %.
Simplified management – safety logic and procedural compliance are embedded in the design, reducing reliance on manual oversight.
Stable safety – combining CT self-shorting and anti-vibration open-circuit protection eliminates the main causes of secondary accidents.

Modular design + reliable CT self-shorting define the next generation of protection testing. Whether at an international EPC site or a domestic retrofit, the TSB-14 is the essential tool for every protection engineer who values precision, efficiency, and safety.

Reimagine your protection testing workflow with a tool designed for both speed and safety.

Ask for a demo unit or technical datasheet for the TSB-14.
Consult with our engineers on integrating modular Testblocks into your existing panels.
Transform testing from a risk-managed task into a standardized, single-person operation.

Contact: 📩 tonyzhang@odes.com.cn

Or visit: 🌐 https://www.odes-electric.com/

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