Product introduction: Discharge ball gap voltage meter (horizontal type)

1、 Product Overview
Discharge ball gap voltage meter (horizontal type) is a kind of standard equipment widely used in high-voltage test field, mainly used for accurate measurement of test voltage, realization of overvoltage protection and calibration of high-voltage system. The device features compact structure, easy operation and stable performance, which is an indispensable tool for insulation and withstand voltage test of power system, scientific research institutions and high voltage laboratory.

2、 Structure composition
The product mainly consists of the following core components:
Movable base: easy to adjust the installation position;
Insulated branch pipe: ensure reliable insulation between the high voltage part and the ground;
High-purity copper ball: provide stable and repeatable discharge characteristics;
Regulating shaft (with ruler): used to accurately set the ball gap distance;
Fine adjustment wheel: fine adjustment of clearance distance;
Water resistance (1 Ω/V): connected in series in the ball gap circuit to effectively limit the discharge current and protect the equipment.

3、 Operating principle and application method
In the high voltage test, connect the ball gap manometer in parallel with the tested object. Check the corresponding discharge distance according to the preset test voltage (such as 60%, 70% and 80% rated value) and the standard Ball Gap Discharge Voltmeter (Table 1 and Table 2), and accurately set the ball gap distance through the fine-tuning wheel.

Record the readings of the voltmeter at the low voltage side of the test transformer (taking the average value of 3-4 times) and draw the voltage-reading relation curve (generally linear) when the ball gap discharges under different voltage ratios. The curve is extrapolated to 110%~115% of the test voltage in a positive proportion as the overvoltage protection threshold during the withstand voltage test, so as to ensure that the test article can be timely protected through the ball gap discharge in case of abnormal voltage rise.

4、 Main features
Applicable to voltage measurement, overvoltage protection and calibration in high-voltage test;
Simple structure, small volume and light weight, easy to carry and install on site;
Stable discharge characteristics, good repeatability and compliance with national standards;
Supporting water resistance design can effectively suppress discharge current and improve safety.

5、 Specification and voltage class
Ball diameter specification (mm): φ 50, φ 100, φ 200, φ 250, φ 300, φ 350, φ 500, φ 650
Applicable voltage class: 50 kV、100kV、150kV、200kV、300kV、400kV、500kV、600kV、750kV、1000kV、1500kV
The corresponding specifications can be selected according to the actual needs)

6、 Environmental Modification Notes
As the air density is affected by air temperature and air pressure, the actual discharge voltage shall be subject to environmental correction. The correction formula is as follows:

\[
V'_2 = S \cdot V_2
\]
\[
S = \frac{0.3869 \cdot P}{273 + t}
\]

Including:
\S ): Relative air density correction factor
\P ): Atmospheric pressure (unit: mmHg)
\T ): ambient temperature (unit: ℃)
\V_2 ): measured discharge voltage
\V'_2 ): the voltage value converted to the standard state (P=760 mmHg, t=20 ℃)

The corrected voltage value is the standard reference value used in the discharge curve.

7、 Safety regulations
Relevant national safety regulations must be strictly observed when using this product, including:
GB 311.6-83 High Voltage Test Techniques - Part 2: Test Procedures (implemented on October 1, 1995)
Preventive Test Code for Electrical Equipment issued by Ministry of Water Resources and Electric Power

Ensure that operators work with certificates, set safety fences in the test area, and take adequate grounding and shielding measures.

Discharge ball gap voltage meter (horizontal type) - accurate, reliable and safe high-voltage test guardian!
 

Main features:

a. This product is commonly used for high voltage test and can be used for ball gap discharge and overvoltage protection.

b. High voltage test, overvoltage protection and high voltage precise measurement, simple structure, small volume, light weight and easy to carry.

 

Specification: φ 50, φ 100, φ 200, φ 250, φ 300, φ 350, φ 500, φ 650

Voltage class: 50kV 100 kV 150 kV 200 kV 300 kV 400 kV 600 kV 750 kV 1000 kV 1500 kV

 

When using the ball gap, it shall be corrected according to the correction coefficient under the air temperature and air pressure during the test, which can be calculated according to the following formula:

V’2=SV2

S=0.3869/(273-t)

Where: S - Relative air density

P - Air pressure (mmHg)

T - air temperature (℃)

V2 - Voltage under test condition

V'2-Voltage under standard state (P=78mmHg, t=20 ℃)

I.e. the voltage obtained from the discharge curve

Specification: φ 50, φ 100, φ 200, φ 250, φ 300, φ 350, φ 500, φ 650

Voltage class: 50kV 100 kV 150 kV 200 kV 300 kV 400 kV 600 kV 750 kV 1000 kV 1500 kV