Explain the principle and use of high voltage divider

The high voltage divider is a special instrument for on-site measurement. It can measure both DC high voltage and AC high voltage. The whole equipment consists of a voltage divider and a measuring instrument. The voltage divider adopts a balanced equipotential shielding structure, and high-quality electronic components are used inside the completely sealed insulating cylinder, so that the entire device has accurate testing, good linearity, and stable performance.

    This article mainly introduces the working principle of the high-voltage divider, firstly introduces the characteristics of the high-voltage divider, secondly introduces the technical indicators and parameters of the high-voltage divider, and then explains the use method and precautions of the high-voltage divider, and the specific follow-up Let's take a look at the editor.

    Product features of high voltage divider

    Using precision high-voltage film capacitors and precision high-voltage glass glaze resistors, the input impedance is high, the test current is reduced, the power consumption is small, and the measurement and stability of the instrument are improved; the signal processing part uses high-performance OP for signal amplification and double integral type AD sampling technology, four-and-a-half-digit liquid crystal display, with a resolution of 0.001kV, is an updated product of high-voltage electrostatic voltmeter.

    2. Good anti-interference performance

    Adopt special shielding technology. The surface of the pressure equalizing ball of aluminum alloy material is smooth and shiny, which effectively improves the electric field distribution around the equalizing ball, prevents discharge, and improves the anti-interference ability of the measurement data. The low-voltage display instrument is shielded with an all-metal enclosed structure, and the high-voltage divider and the low-voltage display meter are connected by high-quality coaxial cables to reduce the impact of high voltage on the display value, thereby achieving high stability and high linearity.

    3. Safe and reliable

    This instrument is composed of a high-voltage divider and a low-voltage display instrument. The high-voltage divider adopts American DuPont filling materials, and is potted with a special process. The structure is smaller, the weight is lighter, and the internal partial discharge is reduced to a lower level, and the reliability is higher. There is no oil leakage problem. When working, the high-voltage divider and low-voltage instrument are connected by coaxial cables, and the high and low voltage parts are far apart, so the work is safe and reliable.

    4. Simple operation

    Use dial switch to switch between high and low voltage, AC and DC, which is convenient and quick. The four-and-a-half-digit LCD directly displays the measurement results, which is simple and intuitive. Bring great convenience to on-site inspection work.

    5. Easy to carry

    It adopts a portable structure, and the whole machine uses an aluminum alloy packing box as the casing, which can be easily disassembled and assembled. Small size, light weight, easy to carry, and very convenient to use.

    Working principle of high voltage divider

    The input voltage of the product is 200V or 400V connected to the matching control box (set), the input voltage is adjusted to the primary winding (low voltage) of the test transformer through the auto-voltage regulator, and the principle of electromagnetic induction is used to connect the secondary winding (high voltage) according to its and The ratio of the turns of the primary winding can be the same multiple

    The output high voltage is continuously adjustable from zero volts to the rated value. When testing DC withstand voltage and leakage current, as long as the high-voltage silicon stack is spin-mounted on the high-voltage output terminal, DC high-voltage can be obtained, and its amplitude is 1.414 times of the power-frequency high-voltage value.



 001.png

    Technical indicators of high voltage divider

    1. Meet the standard: DL/T 846.1-2004

    2. Voltage level: AC: 200kV; DC: 200kV

    3. Measurement accuracy: AC: ±1.5%; DC: ±1.0%

    4. Working environment: Temperature: -5C-40C Humidity: 85%

    5. Input impedance: 800MS2

    6. Output impedance: 0.8M2

    7. High and low pressure partial pressure ratio: 1000:1

    Technical parameters of high voltage divider

    Detailed explanation of the working principle of the high voltage divider

    How to use the high voltage divider

    1. Open the aluminum alloy box and take out the voltage divider barrel, equalizing ball, special digital measuring instrument and special cable.

    2. Place the divider barrel with the base safely and reliably, and install the second section of the divider barrel and the equalizing ball in turn (see Figure 1).

    3. Connect the ground wire firmly to the "ground wire" terminal of the voltage divider base.

    4. Firmly connect the high-voltage lead to be tested with the equalizing ball at the top of the voltage divider.

    5. Insert one end of the dedicated cable into the output hole of the voltage divider, and insert the other end of the DC high voltage divider into the voltage measurement hole of the measuring instrument, and pay attention to the tight connection.

    6. According to the high voltage to be measured, select the throwing position of the measuring instrument.

    7. Load high voltage and record data.

    8. After depressurizing for a period of time, until the measuring instrument shows zero, the master can remove the experimental circuit.

    Precautions for the operation of high voltage divider

    1. There should be no sundries around the device when it is in use, so as not to affect the measurement.

    2. Strictly pay attention to keeping the operating distance to ensure safe operation.

    3. Check the reliable connection of each part, especially the firm connection of the ground wire.

    4. After the measurement is completed, the meter can enter the site until the meter displays zero.

    5. After the DC high voltage measurement is completed, the instrument must be discharged.

    6. It is strictly forbidden to use overpressure, and pay attention to the cleanliness of the surface.

    7. Handle with care, never collide, squeeze, etc.