The automatic anti-interference dielectric loss tester is a core device in the field of electrical insulation testing. Its technical advantage lies in the ability to accurately measure the dielectric loss factor (tgδ) and capacitance (Cx) in a strong electromagnetic interference environment.
I. Application Scope
This instrument is mainly applied in the power system and high-end electrical manufacturing fields. Its core function is to quantitatively assess the insulation status of various power equipment. The specific types of equipment and materials it is applicable to are as follows:
Transformer equipment: Insulating dielectric loss measurement of oil-immersed transformers, dry-type transformers, and reactors;
Transformer equipment: Insulation detection of current transformers, electromagnetic voltage transformers, and capacitive voltage transformers;
Capacitor equipment: Coupling capacitors, circuit breaker voltage equalizing capacitors, and various high-voltage capacitors;
Bushings: Transformer bushings, wall-penetrating bushings, and other types of insulating bushings;
Overvoltage protection equipment: Insulation performance assessment of devices such as zinc oxide arresters;
Insulating materials: Dielectric property testing of insulating oil, insulating paper, insulating films, and other materials.
At the same time, the instrument can be adapted to multiple application scenarios, including railway traction power supply systems, power plants, and industrial and mining enterprise substations, meeting the on-site detection and laboratory testing needs of third-party power inspection institutions.
II. Typical Application Scenarios
1. On-site preventive tests of substation equipment
Substations in operation or standby have strong power frequency electromagnetic field interference, making it difficult for conventional measurement instruments to obtain stable and accurate detection data. This instrument is equipped with variable frequency anti-interference technology, with a common working frequency of 45Hz/55Hz, and is combined with an off-frequency digital filtering algorithm, which can effectively filter out 50Hz power frequency and its harmonics. It can complete precise measurements without disassembling the high-voltage electrical equipment or partially disassembling it, and is often used for regular routine tests and fault diagnosis of transformers, transformers, and bushings.
2. Special tests for capacitive voltage transformers (CVT)
Capacitive voltage transformers are composed of a main capacitor C1 and a voltage dividing capacitor C2 in series. Traditional detection methods require repeated disassembly and reconnection of the wiring, resulting in low work efficiency and a high risk of measurement errors. This instrument has an internal self-excitation test function, allowing for the sequential measurement of the dielectric loss and capacitance of the C1 and C2 capacitor units with a single connection, significantly improving on-site test efficiency and work safety. It is particularly suitable for handover tests and preventive tests of capacitive voltage transformers at 220kV and above.
3. Insulation detection of high-voltage bushings
Transformer bushings, GIS wall-penetrating bushings, and other equipment have a single-ended grounding structure, with one end at a high potential and the other end grounded. Reverse connection measurement mode is required for the measurement. This instrument supports reverse connection measurement mode, connecting the high-voltage core wire to the high-voltage end of the bushing and the shield layer to the bushing flange or equipment housing, effectively suppressing surface leakage current and accurately determining the actual state of the main insulation. It is commonly used for handover tests after major overhauls and before operation of large power transformers.
4. Laboratory analysis of insulating oil and solid materials
In insulation supervision and material research laboratories, when connected to a three-electrode oil cup that meets the GB/T 5654 standard, it can test liquid insulating media such as transformer oil and capacitor oil, determining the aging degree and contamination of the oil. When used with solid electrodes, it can also measure the relative dielectric constant and dielectric loss factor of solid materials such as insulating paper, insulating films, and epoxy resin boards, providing data support for the selection of new insulating materials and the verification of production processes.
5. Field operations without municipal power
Coupling capacitors and line arresters on high-voltage transmission lines are often deployed in remote areas where there is no AC power supply on-site. Portable instruments equipped with a DC battery power supply mode or a generator interface can complete a full set of detection operations without municipal power, meeting the needs of daily inspections and fault investigations of transmission lines in the field.
Post time: May-15-2026