High Voltage Resistance

Why Choose Tiangeng

Professional Production

We are a company specializing in the design, development, and production of precision series resistors, precision sampling resistors, precision shunts, precision resistor dividers, non-inductive resistors, and power resistor.

Strict Management System

We implement a high-tech enterprise quality management system and strictly follow ISO9001 service management standards and work processes. We will establish detailed product files for customers, respond to customer service requests on time, and assist customers in solving problems.

Advanced Equipment

We have advanced production equipment, such as precision photolithography machines, high and low temperature testing equipment, Agilent 3458A and other precision instruments, digital high-resistance calibrators, high-temperature sintering equipment, heat treatment equipment, etc.

Wide Application

The products produced are widely used in sensors, scales, rail transit, ships, new energy, precision automation control, power instruments, medical equipment, power automation control, precision instruments, measuring instruments, automobiles, electromechanical railways, communications and other fields.

What is High-Voltage Resistor?

High voltage resistors, as the name suggests, are specialized electrical components designed to function under high voltage conditions. These resistors are crucial in a range of applications due to their ability to safely manage high voltages and dissipate heat effectively. This piece aims to provide an in-depth understanding of high voltage resistors, their working principles, types, and applications. Offering high resistance and small deviation values, our products enable reduced set circuit signal inconsistencies and more reliable final products.

Custom For High-Voltage Resistors

Many Sizes Available

High voltage resistors are available with different mechanical dimensions - choose the best option depending on your application (up to 35 kV in air).

Coating Options

Choose from a wide range of different materials depending on the ambient conditions.

Flexible Design

The resistors are available in axial or radial versions. The standard wire diameter is 0.6 mm. The flexible design also allows other options, including surface mounted SMD resistors without wire (details on request).

Custom Design

With the help of our R&D team and test laboratory, we develop custom-designed high-voltage flat resistors.

Types of High Voltage Resistors

Wirewound Resistors
These resistors utilize a high resistivity wire wound around a non-conductive core. The winding’s length and thickness determine the resistance value. They can withstand high temperatures and are typically used in power supplies and current limiting applications.

Carbon Composition Resistors
These are made of a carbon powder and binder mixture, which provides the resistive path. Though not as precise as other types, they are highly reliable and can handle high voltage pulses effectively.

High Precision Coaxial Shunt Precision Shunt Resistor

Metal Oxide Film Resistors
These have a metal oxide film as a resistive element. They offer high stability, low noise, and high operating temperatures, making them suitable for high voltage applications.

Thick and Thin Film Resistors
These resistors have a resistive film applied onto a ceramic base. The film’s thickness determines the resistance, and laser trimming can create precise values. These are often used in circuits requiring high precision.

Materials of High Voltage Resistor

Wirewound (WW)
Wirewound ResistorThese types are typically made by winding resistive wire in a spiral around a non-conductive core. The resistive wire is usually a nickel-chromium alloy, and the core is often ceramic or fiberglass. A coating such as vitreous enamel is used for protection.

Carbon Composition (CCR)
Carbon composition ResistorThe resistive element is made from a mixture of fine carbon particles and a non-conductive ceramic material. The substance is pressed into a cylindrical shape and baked. The resistance value depends on the dimensions of the body and the ratio between carbon and ceramic material. More carbon means a lower resistance.

Carbon Film
A thin, pure carbon film is deposited on an insulating cylindrical core. A spiral cut is made in the film to increase the resistive path. This increases the resistance value and is also a way to control the resistance value more precise. Values from 1 Ω up to 10 MΩ are available.

Metal Film

Metal film resistors are usually made of Nichrome, but also other materials such as tantalum nitride is used. The resistive film is printed on a cylindrical or flat insulating substrate. The resistive material is a combination of a Ceramic material and a Metal, and therefore these resistors are also referred to as Cermet.

Metal Oxide Film

They are similar to metal film with the difference that the resistive material is a metal oxide, such as tin oxide. These durable resistors feature a better reliability and stability than metal film resistors. Furthermore the operating temperature is higher. Therefore they are more used in applications requiring a high endurance.

Foil

The resistive element is a thin bulk metal foil that is cemented on a ceramic substrate. The foil thickness is several micrometers. Inherent to the mechanical design, they feature a very low temperature coefficient of resistance. They are used for applications with high precision requirements.

Applications of High Voltage Resistor

Power Distribution Systems
High-voltage resistors are used in power distribution systems for voltage division, current sensing, and overvoltage protection. They help in controlling and monitoring the flow of high voltage in the systems.

Medical Equipment
They are employed in medical devices like X-ray machines, defibrillators, and medical imaging equipment where high voltage is required. High-voltage resistors assist in regulating and controlling voltage levels within these systems.

Industrial Automation
High-voltage resistors are used in industrial automation applications for controlling motors, power supplies, and high-voltage circuits. They help in maintaining precise voltage levels for optimal performance.

Telecommunications
In the telecommunications industry, high-voltage resistors are used in signal conditioning, voltage regulation, and impedance matching in high-voltage circuits and transmission lines.

Testing and Measurement Instruments
They find use in testing and measurement instruments for calibration, voltage measurement, and high-voltage circuitry testing, ensuring accurate readings and safe operation.

Aerospace and Defense
High-voltage resistors are crucial components in aerospace and defense applications, such as radar systems, missile guidance systems, and high-voltage power supplies in military equipment, ensuring reliability and safety in high-stress environments.

Tips for Designing With High-voltage Resistors

Understanding voltage ratings.
Voltage division with discrete resistors.
Specifying integrated voltage dividers.
Evaluating TCR and VCR errors in dividers.
Calculating the value of a bleed resistor.
Selecting the right balancing resistor.
Withstanding high voltage surges.
Designing to meet safety standards.
Optimising the PCB layout.
Designing for potted and oil-filled assemblies.

Factors for Selecting High-Voltage Resistors

01/

Resistance value
When selecting, the appropriate resistance value needs to be selected based on parameters such as voltage and current in the circuit. During the selection process, factors such as voltage resistance characteristics, accuracy, and power need to be comprehensively considered.

02/

Withstand voltage
High-voltage circuits need to withstand higher voltages, so the voltage-withstand characteristics of the selected high-voltage resistor must be able to meet the circuit requirements, which usually need to be several times higher than the operating voltage of the circuit.

03/

Accuracy and stability
Resistors used in high-voltage circuits have high requirements for resistance accuracy and stability. When selecting, attention should be paid to their accuracy grade and temperature drift.

04/

Commonly used materials
Carbon layer resistors, metal film resistors, tungsten film resistors, and vacuum evaporation resistors are the four commonly used high-voltage resistor materials.

05/

Specifications and dimensions
The specifications and dimensions of the high-voltage resistor need to meet the circuit requirements, and factors such as installation space and heat dissipation capacity also need to be considered.

06/

Brand and quality
Brand and quality also need to be considered when selecting high-voltage resistors. When purchasing electronic components, you need to choose formal channels and brands to ensure product quality and after-sales service.

Safety Precautions When Working with High Voltage Resistance

Turn Off Power
Always turn off the power to the circuit you are working on before handling or replacing resistors. This prevents electrical shock and accidental damage to the components or the circuit.

Use Proper Tools
Utilize appropriate tools, such as needle-nose pliers or tweezers, to handle and install resistors. Using the correct tools minimizes the risk of injury and damage to the components.

Wear Safety Equipment
Protective gear like safety glasses and gloves can prevent injuries while working with electronic circuits. It is essential to wear them, especially when soldering or cutting leads.

Be Aware of High Voltages
Some circuits may contain high voltages even when the power is turned off. Always double-check the voltage levels with a multimeter before handling resistors in such circuits.

Observe Polarity and Ratings
Pay attention to the polarity of components and the power ratings of resistors. Installing a resistor with incorrect polarity or inadequate power rating can lead to circuit malfunction or damage.

Use Heat Sinks and Ventilation
When working with power resistors, they can become hot during operation. Use heat sinks to dissipate heat and ensure proper ventilation to prevent overheating and possible burns.

Avoid Static Discharge
Static electricity can damage sensitive components in electronic circuits. Always ground yourself with an anti-static wrist strap or touch a grounded metal object before handling resistors.

Properly Dispose of Damaged Resistors
Do not attempt to repair damaged resistors. Instead, dispose of them safely and replace them with new ones. Damaged resistors can cause circuit malfunction and pose a safety hazard.

Our Factory

Based on many years of producing various precision resistors, our company designs, develops, and produces various resistor cabinets, coaxial resistors, and metal foil standard resistors.

Company Honor

Based on the high-tech enterprise quality management system, we strictly follow ISO9001 service management standards and work processes.

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Frequently Asked Questions

Q: What is a high power resistor used for?

A: Power resistors are used to dissipate energy by converting it to heat. They are designed to maintain stable performance under heavy loads and to handle thermal conditions safely. Power resistors are usually physically larger than other resistors, and are designed for higher loads - typically over one watt.

Q: What resistors are best for high voltage?

A: If you need a high-power non-inductive resistor, you can use cermet (ceramic-metal mix) or metal oxide resistors. These are constructed much like a carbon comp resistor, substituting the cermet or metal oxide for the carbon composition material.

Q: What material is high voltage resistor?

A: High voltage resistors are manufactured (to ISO 9001-2000 Standards) from a carefully blended mixture of clays, alumina and carbon. After mixing and granulating, the material is pressed to the required shape, with diameters ranging from 3 to 152mm.

Q: What happens to a resistor if the voltage is too high?

A: Under excessive voltage, a resistor generates so much heat that it cannot dissipate the heat quickly enough to prevent burning. When designing any type of circuit, all possible causes of circuit instability or failure need to be taken into consideration, as do the consequences of these effects.

Q: When would you use a resistor?

A: As mentioned in the resistor definition, the main purpose of a resistor is to control or reduce the amount of current in a circuit. In a simple circuit, the amount of current flowing in the wires depends not only on the voltage source but also on how much the wire and the electrical component resist the current.

Q: What is the difference between a power resistor and a resistor?

A: The power rating of a resistor is measured in watts, and it's usually somewhere between ⅛W (0.125W) and 1W. Resistors with power ratings of more than 1W are usually referred to as power resistors, and are used specifically for their power dissipating abilities.

Q: Which type resistor is most commonly found in high power electrical applications?

A: Wirewound resistors are often produced for high precision or high power applications. They have low noise, are robust, and are temperature stable。

Q: What type of resistor commonly used for high wattage applications?

A: Film or Cermet Resistor – Made from conductive metal oxide paste, very low wattage values. Wire-wound Resistor – Metallic bodies for heatsink mounting, very high wattage ratings. Semiconductor Resistor – High frequency/precision surface mount thin film technology.

Q: What's resistor used as voltage devices?

A: A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to provide a specific voltage for an active device such as a transistor.

Q: What kind of electronics have resistors?

A: Some use resistors as power components, such as electric rice cookers, electric ovens, electric heaters, and other heating appliances. Some use resistors as components of control circuits, such as refrigerators, televisions, air conditioners, mobile phones, and so on.

Q: What voltage are resistors rated for?

A: Resistors have a maximum operating voltage which can be applied across it , this may vary between manufacturers. Example 1/8 & 1/4 w can stand up to 200v, 2 & 3 W can withstand upto 500V, metal glazed resistors can withstand up to 1000V.

Q: What can break a resistor?

A: Too much voltage or more often too much heat dissipation. A different fault can cause excess current that causes the resistor to overheat.

Q: Does a resistor go on positive or negative?

A: Even though it doesn't matter which way you place your resistor, current flows from positive to negative. While resistors don't have their own polarity they will typically be part of a circuit that does, thanks to other components like capacitors. In a DC circuit, the current will always flow in only one direction.

Q: What happens if you put a resistor in a circuit?

A: Limiting current: By introducing resistance into a circuit, resistors can limit the amount of current that flows through the circuit. In accordance with Ohm's law, if the voltage in a circuit remains the same, the current will decrease if you increase the resistance.

Q: Where should resistor be placed?

A: In a typical LED circuit, the resistor should be placed on the side of the LED that is connected to the positive voltage source. This is important for limiting the current flowing through the LED and protecting it from damage.

Q: Does a resistor reduce voltage or amps?

A: Generally, resistors decrease the current as they “resist” current flow in any circuit. This fact generally causes a reduction in circuit voltages due to the restricted current flow, hence lower differential voltage drop across different elements in any given circuit.

Q: Are resistors AC or DC?

A: Resistors can be used in both AC and DC circuits whereas inductors can only be used in DC circuit.

Q: Can a resistor act like a fuse

A: A fusible resistor opens like a fuse when its current rating is exceeded. The component is generally a nichrome element with a melting temperature of around 1,400°C. Nichrome has a low thermal coefficient of resistance which allows the resistor to have a stable resistance over temperature.

Q: Which resistor is the most powerful?

A: Wirewound resistors are the most powerful and precise, although they typically exhibit one or the other characteristic.

Q: What does the gold band on a resistor mean?

A: The gold band means that the resistor has a tolerance of 5%. The resistance value lies therefore between 5320 and 5880 Ω (5560 ± 5%).

Q: What is the most common resistor used in consumer devices?

A: Fixed resistors with excellent pulse resistance that use a carbon film as a resistive element, and have long been the most popular resistor.

Q: What are the two main types of resistors used in electrical circuits?

A: Our portfolio features two types of resistors: fixed resistors (including surface mount, through-hole, and chassis mount), which offer one resistance value and are used in almost all applications; and variable resistors (including potentiometers and trimmer potentiometers, also known as trim pots), which offer broad resistance values and are predominantly used to control either current or voltage by changing the resistance value.

Q: What causes a resistor to fail?

A: A fixed resistor normally fails in an open configuration when it is overheated or overly stressed due to excessive power, temperature, vibration, or shock. Excessive humidity can cause an increase in resistance. A variable resistor can wear after excessive use; worn away particles can cause high resistance short circuits.

Q: Which is better wire wound or ceramic resistor?

A: Ceramic resistors can obtain greater power dissipation in one third of the footprint of wire-wound resistors, delivering excellent performance where high peak power or high-energy pulses must be handled in small and efficient spaces.

We're well-known as one of the leading high voltage resistance manufacturers and suppliers in China. If you're going to buy or wholesale high quality high voltage resistance made in China, welcome to get more information from our factory.

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