18 Aug-2026

1. Basic Information & Compliance Standards

• Product Name: Electroscope Start-up Voltage Test Stand
• Model: KDJS-YD 220kV
• Compliance Standards: DL/T 976-2017 (Preventive Test Code for Live Working Tools, Appliances and Equipment), DL/T 1476-2023 (Preventive Test Code for Electric Power Safety Appliances), and DL/T 740-2014 (Capacitive Electroscopes).
• Application Scope: Suitable for start-up detection, in-phase interference detection, and anti-phase interference detection of electroscopes ranging from 10kV to 500kV (including 220kV).

2. Core Technical Parameters

• Ring Electrode Diameter: 1050 mm
• High-Voltage Spherical Electrode Diameter: 100 mm
• Electric Field Center Height (Distance from Electroscope Center to Ground): 2500 mm
• Rated Voltage: 250 kV
• Voltage Range: 0 ~ 250 kV
• Voltage Measurement Error: < ±(1%U + 0.5%Umax)
• Power Supply: AC 220V / 50Hz
• Number of Test Roots: 1

3. Structure & Operational Features

• Electrode Structure: Spherical high-voltage electrode and ring-shaped grounding electrode are respectively fixed on the support stand.
• Control Methods: Supports wireless remote control for left-right movement of the slider, while also featuring an electric control button on the base platform's safety appliance controller. Manual adjustment is also available.
• Distance Adjustment: Both the test base platform and the stand are equipped with scale rulers for intuitive and precise adjustment of the gap between the spherical and ring electrodes.
• Environmental Requirements: When testing 66kV to 500kV electroscopes, no other objects shall be placed within a 2.5m radius around the stand.

4. Summary of Factory Inspection Data (Report No.: 2401152)

• Insulation Performance: Insulation resistance between conductive parts and ground reaches 1000 MΩ; passed 1500V power frequency withstand voltage test for 60 seconds.
• Error Calibration: Calibrated using a 0.5-class precision high-voltage divider (FRC-250kV). Across the full range from 25kV to 250kV, the voltage error is strictly controlled within ±0.4%, demonstrating excellent performance.

Fortifying the Power Safety Line: KDJS-YD 220kV Electroscope Test Stand Facilitates Precise "Health Checks"

In daily operations and maintenance of power systems, high-voltage electroscopes serve as the critical "lifeline" to confirm whether equipment is de-energized and to prevent catastrophic misoperations, such as closing grounding switches on live lines. However, after prolonged exposure to intense outdoor electric fields, extreme temperature fluctuations, and daily mechanical wear, the internal signal conversion components of electroscopes are highly susceptible to sensitivity drift or insulation aging. Once an electroscope "fails" or provides a false "no-voltage" signal at a critical moment, it can directly lead to severe electrocution fatalities or arc flash explosions. Therefore, conducting regular, professional preventive tests on electroscopes is an indispensable core procedure to ensure the safety of power operations.

Why is Regular Testing of Electroscopes Necessary?

A verified international case highlights the fatal consequences of neglecting this necessity. In 2018, a fatal accident occurred at a power plant in Texas, USA. During a routine maintenance shutdown, a worker used an electroscope to verify that a 13.8kV bus was de-energized. Although the electroscope passed its pre-use self-test, it failed to indicate the presence of residual voltage during the actual inspection. Relying on this false negative, the worker proceeded without grounding the line and was fatally electrocuted by an unexpected backfeed. Subsequent investigations revealed that the electroscope's internal capacitive elements had degraded over time, causing its start-up voltage threshold to exceed safe limits, rendering it completely ineffective despite passing basic self-checks.

The primary purpose of regular testing is to eliminate safety hazards invisible to the naked eye. In accordance with national and international standards such as DL/T 1476-2023, electroscopes must undergo periodic start-up voltage and power frequency withstand voltage tests. Professional testing can accurately identify fatal defects, including insulation damage, start-up voltage deviation, and delayed acoustic/optical alarms. Furthermore, regular testing is a mandatory compliance requirement. Using uninspected or overdue safety appliances not only violates regulations but also represents extreme negligence toward workers' lives. Additionally, preventive testing extends the service life of the tools and reduces power outage losses caused by sudden equipment failures, representing a highly cost-effective safety investment.

Why Use a Professional Test Stand for Calibration?

The core testing indicator for an electroscope is its "start-up voltage," which must strictly fall between 10% and 45% of the rated voltage. A threshold below 10% makes the electroscope overly sensitive, causing false alarms; a threshold above 45% results in a sluggish response, failing to alert workers in genuine emergencies. Accurately measuring this threshold requires establishing an absolutely uniform electric field, which is the core value of an electroscope test stand.

The KDJS-YD 220kV Electroscope Start-up Voltage Test Stand is custom-engineered to meet these stringent demands. Utilizing a standard spherical high-voltage electrode and a ring-shaped grounding electrode, the device perfectly simulates a distortion-free standard electric field. With an electric field center height of 2.5 meters and a ring electrode diameter of 1050mm, it fully complies with testing specifications for 66kV to 500kV high-voltage electroscopes. Moreover, the equipment innovatively incorporates dual control mechanisms: wireless remote control and electric micro-adjustment. This allows operators to precisely adjust the electrode gap from a safe distance, completely eliminating the safety hazards associated with traditional manual operations. Combined with its ultra-high measurement precision of < ±(1%U + 0.5%Umax), this stand ensures that every start-up voltage calibration is scientific, accurate, and repeatable, building a solid technological fortress for the personal safety of power maintenance crews.

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