ZH_CN
The LH2408 switchgear Partial Discharge Intelligent Monitoring Unit is suitable for gas-insulated switchgear with voltage levels of 40.5kV and below. It can real-time monitor basic partial discharge parameters such as discharge peak value, discharge average value, discharge phase, number of discharge pulses, and number of discharge cycles, and evaluate the danger level of the discharge. The data is further transmitted to a background server or other data receiving terminals through an RS485 interface. It can also perform spectrogram analysis, form data reports, provide statistical quantities of relevant parameters, and store test spectrograms and discharge trends, so as to timely detect insulation defects inside the switchgear, provide criteria for evaluating its insulation level and aging degree, and provide a basis for the condition-based maintenance of the switchgear.
LH2408 Main Technical Parameters
Ultrasonic and geodetic wave partial discharge sensors (AA and TEV) | ||
Parameter Name | Technical Specifications | |
1 | Detection frequency band | Ultrasound: 20k~100kHz/Heterodyne 38.4kHz TEV ：3M~100MHz |
2 | Sampling rate | ≥100MS/s |
3 | Measurement range | Ultrasound：0~70dBuV TEV ：0~60dBmV |
4 | Resolution and Error | Resolution：1dB Error：±1dB |
5 | Linearity | Better than 10% |
6 | Power Supply | High-energy temperature-resistant battery |
7 | Working Method | 1s/24h |
8 | Operating temperature | Industrial grade：-40~85℃ |
9 | communication method
| LoRa/GFSK |
10 | communication parameters
| Wireless frequency band : 470MHz-510MHz Maximum transmission power：17dBm Transmit/Receive/Sleep Current: 75/mA/20mA/2uA |
11 | Outline dimension | Length × Width × Height：160mm*80mm*30mm |
12 | Installation method | Magnetic suction surface-mount type |
Temperature and Humidity Sensor | ||
13 | Temperature measurement range and error | Scope:-40℃~70℃ error：±0.3℃ |
14 | Humidity measurement range and error | Scope: 0~100%RH error：±3%RH |
Features：
Ø It adopts a temperature-resistant high-energy battery for power supply, low power consumption design, and performs a 'sampling physical examination' on the device every 24 hours. The continuous working time is not less than 6 years, greatly simplifying the installation work at the site.
Ø It is equipped with an internal ultrasonic sensor (AA) and a transient earth voltage sensor (TEV) to simultaneously monitor partial discharge signals in high-voltage switchgear.
Ø Built-in temperature and humidity sensors to monitor the air environment inside the distribution room or switchgear cabinet.
Ø Magnetic suction surface mount, compact structure, easy installation, can be used for long-term monitoring of key stations, key equipment, and abnormal equipment.
Ø Adopting 12Bit resolution A/D conversion and a high-performance FPGA processor, it can achieve 100M continuous sampling of data for more than 50 power frequency cycles.
Ø The combined application of band-pass filtering technology and noise identification and elimination algorithms can effectively identify partial discharge signals.
Ø High sensitivity, capable of detecting partial discharge signals above 10pC.
Ø It can provide partial discharge information such as discharge peak value, discharge mean value, discharge noise, discharge phase, number of discharge pulses, number of discharge cycles, and three-level alarm identification.
