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HF Series High Frequency Partial Discharge Monitoring Sensor
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HF Series High Frequency Partial Discharge Monitoring Sensor

TRHF series high frequency partial discharge sensor is a sensor that can be widely used for partial discharge detection of high voltage electrical equipment such as cables, switchgear, GIS, generators, PT cabinets, circuit breakers and so on in various power levels. It can be installed on the grounding line of the cable input bushing/surge capacitor, on the cable body or shield grounding line, on the secondary winding of the current transformer in the switchgear, and on the neutral line of the generator and transformer. Reliable real-time online monitoring and diagnosis of discharges occurring on high-voltage equipment to digitalize substation maintenance. For end-users in the expected life cycle of the equipment, the local in line assessment to ensure the safe and reliable operation of the equipment to provide a strong basic support.
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Product Overview


Partial discharge monitoring is now an internationally recognized and widely used technical means to diagnose the insulation condition of equipment. It is mainly used for routine inspection or on-site testing of high-voltage equipment in substations. It is used to monitor and analyze the partial discharge signals inside the gas-insulated switchgear (GIS) equipment, analyze them centrally through the data analysis system, display and output alarms, and then monitor and evaluate the operation status of the GIS equipment, so as to effectively avoid sudden accidents of the GIS high-voltage equipment. The large amount of local discharge data and the complexity of the site make its real-time monitoring a challenging task.

When local discharge occurs inside the cable, high-frequency current will propagate along the ground wire to the earth, and local discharge detection is realized by installing a high-frequency local discharge sensor on the ground wire to detect the high-frequency current signal. High-frequency local discharge sensors use the Rogowski coil method, in the toroidal core material around a multi-turn conductive coil, high-frequency current through the center of the core and the high-frequency alternating electromagnetic field caused by the coil will produce induced voltage. There is no electrical connection between the measurement loop of the sensor and the current under test, which is a non-intrusive detection method and does not require the equipment under test to be shut down. By using a localized line monitoring system to monitor monitoring and localized discharge trend activity, its development over time can be continuously observed so that high-voltage cables or cable accessories can be replaced in a timely manner before a fault occurs.


Product Features


*   Good linearity and high precision; fast response speed, which can reach ns level.

*   Frequency bandwidth, can work in the range of 100kHz ~ 50MHz.

*   Opened and closed structure, easy to install.

*   The waterproof level can reach IP68, which can be used indoors and outdoors.


Application


*   Partial discharge online monitoring system, SF6 circuit breakers of various voltage levels, gas-insulated combined electrical appliances (GIS) equipment, cabinet switches, column switches, transformer equipment and primary high-voltage transformers.


Type

TRHF-60


F

Operating Frequency Range

0.1MHz~50MHz

S

Sensitivity

5pC

Z C

Transmission Impedance

12mV/mA

RM

Matched Impedance

50Ω

Ta

Operating Temperature

-40℃~+85℃

Ta

Storage Temperature

-40℃~+100℃

O

Output Interface

BNC socket or RG5850-3/SMA copper coaxial cable

P

Protection Class

IP68

Φ

Bore Diameter

Φ60mm

W

Weight

Around 1.1kg


Dimension and Connection


Amplitude-frequency characteristics


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