Surge Arrester Online Monitoring Device
Product Overview
The YHJCQ-type surge arrester online monitoring instrument (hereinafter referred to as the “monitor”) is equipped with a high-precision digital data acquisition unit connected in series on the arrester’s grounding conductor, enabling real-time monitoring of the arrester’s leakage current and recording of its discharge count and discharge duration. The YHJCQ-type surge arrester online monitoring instrument can fully replace conventional JS-8 discharge counters and JCQ surge arrester monitors. Featuring a simple display interface and a highly accurate monitoring system, it provides dynamic monitoring of key parameters such as arrester leakage current and operation count. Equipped with a 485 communication interface and wireless communication network, it facilitates integration into comprehensive automation systems and is well suited for use in smart substations.
Operating principle of the device
The YHJCQ-type surge arrester online monitoring instrument primarily consists of a high-precision digital data acquisition unit and an intelligent controller (as shown in Figure 1). The surge arrester is grounded via the accompanying high-precision digital data acquisition unit, which captures both the leakage current signal and the discharge current signal. These signals are then transmitted to the device’s central processor through an isolation and transformation module, enabling the recording of the number of arrester operations, the timing of each operation, and the leakage current. Furthermore, the intelligent controller can measure the unbalanced leakage current at the three-phase neutral point by analyzing the phase relationships among the three-phase leakage currents, and, leveraging the sensitive response of the neutral-point current, it can detect early-stage faults in the surge arrester.
This device is equipped with audible alarm and display alarm functions. It can trigger audible and visual alarms based on the leakage current of the three-phase surge arresters and the magnitude of the neutral-point current. When either current exceeds the specified threshold, the device’s alarm system is activated. Notably, the neutral-point current exhibits extremely high alarm sensitivity: under normal (balanced) three-phase conditions, the zero-sequence current approaches zero; however, if an early fault occurs in one of the phase arresters, the leakage current will change, enabling the device to issue a signal within 10 milliseconds and thereby accurately and sensitively determine whether the arrester is operating normally.
Structural Features
The YHJCQ surge arrester online monitoring instrument can sensitively and accurately measure the arrester’s leakage current and number of discharges, featuring precise counting, large data storage capacity, intelligent query functions, a simple and intuitive display interface, a compact structure, and panel-mount installation. The instrument’s performance complies with the requirements of JB/T 10492-2011, “Monitoring Devices for Metal Oxide Surge Arresters.” Its key specifications include: the discharge counter operates reliably and accurately under impulse waveforms of 8/20 µs with amplitudes ranging from 50 A to 100 kA; it exhibits low residual voltage and boasts an exceptionally high current-carrying capacity; and the leakage current display range is 0–3 mA.
1. Strong anti-interference capability, enabling operation in complex electromagnetic environments;
2. Features panel fault display and audible alarm, with relay alarm signal output;
3. Features real-time monitoring of leakage current, as well as the ability to view fault records for discharge counts and discharge durations.
4. The clock within the device maintains accurate timekeeping even after a power outage, eliminating the need for recalibration upon power restoration. Furthermore, the memory data is equipped with power-loss protection, ensuring that the recorded data will not be lost over the specified retention period of 50 years.
5. All alarm thresholds can be set via the panel;
6. RS485 communication interface, enabling multi-device communication or communication with a host computer, making it suitable for use in smart substations.
Installation and External Dimensions
Install according to Schematic Diagram 1 and Diagram 2. The three high-precision data collectors shall be installed on the grounding conductors of the A-phase, B-phase, and C-phase surge arresters, respectively.
Installation Diagram of High-Precision Digital Sensor and 10 kV Surge Arrester
Installation Diagram of High-Precision Digital Sensor and 35 kV Surge Arrester
High-precision digital sensor dimensions
JCQ External Dimensions and Installation Dimension Drawing
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