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General| Gas Accumulation Detection | Yes |
|---|---|
| Oil Level Drop Detection | Yes |
| Frequency | 50/60 Hz |
| Test Facility | Yes |
| Protection Functions | Buchholz protection |
Steps to prevent damage from static discharge when handling modules.
Procedures for handling modules and storing them in conductive bags.
General safety, symbols, installation, and servicing precautions.
Safety for CT circuits, resistors, batteries, testing, and modules.
Safety for older products, decommissioning, and disposal procedures.
Recommended maximum rating for the external protective fuse.
Insulation class requirements for user safety.
Qualification testing at 5kV peak for installation category.
Compliance with generic safety standards for pollution degree.
Compliance with Low Voltage Directive and generic safety standards.
High-speed biased differential relays for transformer protection.
Details on MBCH12, MBCH13, and MBCH16 models.
Careful treatment, site selection, and initial checks for protective relays.
Procedures for unpacking, handling, and storing relays to prevent damage.
Requirements for clean, dry, and well-illuminated installation sites.
Inspection, wiring, earthing, insulation, and safety precautions before testing.
List of equipment required for relay testing.
Verifying the DC auxiliary supply voltage and polarity.
Testing and verifying relay settings against expected values.
Testing the relay's operating time under different current injections.
Testing and verifying the bias characteristics of the relay.
Checking bias connections and circuit breaker tripping functionality.
Testing relay operation under load and magnetizing inrush conditions.
High-speed biased differential relays for transformer protection.
Arranging schemes for optimum performance with matched CTs.
Using transformers for ratio and phase matching of CTs.
Applications for single, three-phase, and three-winding transformers.
Recommended differential settings for stability and spill current management.
Troubleshooting steps for a suspected faulty module.
Troubleshooting steps for relay operation and tripping contacts.
Troubleshooting steps involving TP4 voltage and transformer T3.
Troubleshooting steps for multiple PCB or transformer faults.
Advanced troubleshooting for PCB and transformer issues.
Diagnosing issues with magnetizing inrush current testing.
Fields for relay model, serial numbers, and settings.
Recording results for relay settings, operating time, and bias checks.
Recording results for on-load and inrush current tests.
Fields for commissioning engineer and customer witness signatures and dates.
Information about parameters and tests during fault occurrence.
Recording expected and actual fault behavior and visual damage.
Details on fault timing, indications, and additional remarks.
Fields for signature, name, title, and company name.
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