The 7SN8D-T passive VPIS voltage presence indicator is a cabinet-mounted safety monitor manufactured by Xizi Energy Co., Ltd. As a fully passive design (no working power supply required), it serves as a direct DXN8D-T replacement live display for 12kV rated indoor medium voltage power distribution systems.
Standard L1(yellow), L2(green), L3(red) phase terminals with dedicated ground pins, engineered to pair precisely with 20pF matching capacitive voltage sensors labeled on the rear specification sticker. Isolated terminal circuits eliminate signal interference for stable electrostatic voltage detection inside sealed switch cabinets.
Every 7SN8D-T unit comes with a factory-standard front ON/OFF self-test button. Operators activate the test circuit pre-maintenance to confirm all phase indicator lights function properly, eliminating hidden faults in unattended substations. The passive circuit design ensures zero power consumption during routine monitoring.
Labeled “No Working Power” on the rear nameplate, this passive VPIS draws zero auxiliary supply power, simplifying cabinet wiring and reducing long-term operational risks. Standard embedded mounting dimensions enable drop-in retrofit for legacy DXN8D-T and GSN-T live display units with zero cabinet modification.
Specified “No Contact Rated Load” on the product sticker, this model focuses purely on visual voltage status indication, the most widely adopted configuration for standard five-prevention safety frameworks in municipal, industrial, and renewable energy switch rooms. For signal interlock output, select our 7SN8D-Q contact-type variant.
Base rated voltage is 12kV, compatible with full 7.2kV / 24kV / 40.5kV indoor AC 50Hz high voltage grids on custom request. Robust fire-retardant housing withstands -30°C ~ +60°C operating temperatures, suited for indoor fixed and withdrawable switchgear assemblies.
| Specification Item | Official Sticker Parameter |
|---|---|
| Model Number | 7SN8D-T |
| Full Product Name | Indoor H.V. Alive Displaying Device Indicator |
| Rated Voltage | 12kV (base model; 7.2kV/24kV/40.5kV customizable) |
| Matching Capacitance | 20pF capacitive voltage sensor |
| Working Power Voltage | Passive, No auxiliary power supply required |
| Contact Rated Load | No contact / relay-free output |
| Production Standard Frequency | 50Hz (60Hz available for export markets) |
| Mounting Style | Embedded panel installation (cabinet door) |
| Phase Marking | L1(Yellow), L2(Green), L3(Red) |
| Standard Function | Front panel ON/OFF manual self-test switch |
| Compliance Standard | DL/T 538 High-Voltage Live Display Device Industry Standard |
| Dielectric Withstand | 2000V, 1 minute power frequency withstand |
| Operating Temp | -30℃ ~ +60℃; Humidity ≤95% non-condensing |
| Max Installation Altitude | ≤1000m (high-altitude modified units available) |
1. Sensor Matching Connection: Wire L1/L2/L3 terminals to 20pF capacitive voltage sensors fitted to cabinet bushings or main busbars, per rear label capacitance specs.
2. Passive Live Detection: No external power needed—electrostatic induction from energized high-voltage busbars activates internal indicator lights to show live phase status.
3. Pre-Service Self-Check Cycle: Toggle front switch to ON to run a full circuit diagnostic; all three phase lights illuminate to confirm healthy hardware. Switch back OFF for continuous real-time monitoring.
4. Visual Safety Alert System: Provides clear visual warning to technicians; pair with mechanical interlock latches for full five-prevention anti-misoperation protection (electromagnetic locks sold separately).
Perfect passive voltage monitor for RM6 compact ring main units, XGN15, HXGN fixed 12kV switch cabinets in urban distribution substations and municipal power grid stations. Matches standard 20pF RMU capacitive sensors out of the box.
Low-power passive design ideal for battery energy storage containers, solar PV booster stations, and wind farm medium voltage switch rooms. Zero auxiliary power draw reduces load on station backup power systems.
Universal panel size and passive signal architecture fit ABB, Schneider, Siemens, and domestic Chinese brand KYN28 withdrawable switchgear. Ideal for factory HV power rooms, chemical, mining, and steel mill distribution equipment retrofits.
Space-saving embedded panel form factor fits compact GIS gas-insulated switchgear for dense urban substation installations, requiring reliable passive live-phase visual monitoring.
3. Panel cutout matches DXN8D-T industry standard for plug-and-play swap during cabinet upgrades.
4. Mechanical interlock latches recommended for full five-prevention compliance; electromagnetic lock accessories available for separate order.
1. Label-Verified Passive No-Power Construction: Eliminates auxiliary power failure risks, a top reliability benefit for unattended power sites.
2. Factory Calibrated for 20pF Sensors: Pre-tuned circuit matching our OEM capacitive sensors for consistent, accurate live voltage readings.
3. Drop-In DXN8D-T Equivalent Replacement: Identical mounting footprint to mainstream legacy live display models to cut retrofit labor costs.
4. ISO & DL/T 538 Certified Manufacturing: factory full quality inspection, documentation available for global export tender bids and EU CE declaration requests.
5. Flexible Customization: Adjust rated voltage (7.2/12/24/40.5kV), frequency (50/60Hz), and OEM labeling for distributor partners.
6. Complete Technical Support: Supply official nameplate spec sheets, wiring diagrams, and remote engineering consultation for switchgear integrators worldwide.
TSN8D-T vs DXN8D-T: The TSN8D-T is a direct drop-in replacement for older DXN8D-T units, with identical panel cutout dimensions and improved self-test circuit reliability.
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