Overview
The online insulation monitoring system comprises three essential components: the main controller (host), the current collector, and the dedicated DC leakage current sensor. The main controller serves as the central control unit for the entire system, functioning as the primary interface for monitoring information display and setting information input. Sensors are installed at each DC feeder outlet loop. Positioned between the host and the sensor, the current collector offers flexibility in installation location based on requirements. It can be directly linked to the host via the communication bus or indirectly connected through the cascade port of another slave machine, simplifying installation and wiring. Each current collector can connect with up to 8 sensors.
Working principle of ZJS-102 online insulation monitoring system
In balanced bridge detection mode, the insulation monitor computes the system’s equivalent resistance to the ground by utilizing the system-to-ground voltage. It then determines the equivalent resistance value for each branch based on the current returned by individual current detectors. In unbalanced bridge detection mode, the online insulation monitoring system utilizes the internal unbalanced bridge to calculate the actual positive and negative resistance of the system to the ground. Subsequently, it calculates the actual positive and negative resistance of each branch to the ground based on the current change values from each current detector under the unbalanced bridge.
Apart from the manually set working modes, the insulation monitor device can enter various working modes based on user-selected function items. These include balanced bridge calculation mode, voltage balance mode, instantaneous ground detection mode, and waiting mode.
Function & Feature of Insulation Monitoring System
- Real-time monitoring of system AC and DC voltage and alarm
Real-time monitoring of system bus-to-ground voltage, including system voltage, positive-to-ground voltage, negative-to-ground voltage, and AC channeling voltage, and displays them in real-time. When the voltage exceeds the preset setting value, the host LCD screen displays alarm information, and the voltage over-limit indicator light and buzzer alarm simultaneously.
- Real-time monitoring of system insulation and alarms
Real-time monitoring of system bus-to-ground impedance, including positive-to-ground resistance and negative-to-ground resistance, and displays them in real-time. When a fault occurs in the DC system and the positive and negative voltages to the ground are no longer balanced and exceed the preset setting value, the host LCD screen displays an alarm message, and the system grounding indicator light and buzzer alarm at the same time.
- Instantaneous ground recording function
This insulation monitor can set instantaneous ground sampling wave recording functions at different frequencies such as 1KHz, 500Hz, 250Hz, and 125Hz. Each record provides 8-channel waveforms, including positive and negative ground voltages and up to 6 instantaneous ground loop currents.
- Grounding history analysis
The insulation monitoring system can automatically save AC current leakage and grounding records in EEPROM, including detailed information such as date and time, ground impedance, leakage voltage, etc., while providing complete historical records, including system and loop fault information.
- Voltage balancing function
The insulation monitor employs an internal ground voltage deviation compensation bridge to rectify the DC system ground voltage to a balanced state if the ratio of the DC system negative bus voltage to ground surpasses 1.222 compared to the positive bus voltage.
- Battery circuit insulation monitoring function
The insulation monitoring device monitors the battery circuit in real-time through a data collector and Hall sensor, detects insulation degradation or ground fault, and can also locate the number of faulty batteries. When using the monitoring function, the data collected by the corresponding Hall sensor is the real-time data of the battery circuit. data.
- The system-distributed capacitance detection function
It can detect the distributed capacitance of the DC system connected to this device.
- Equipment self-test function
The insulation monitoring system self-tests each module when it is powered on, detects the connection status of the balance bridge in real-time during operation, and at the same time regularly detects the bridge connection status.
- Circuit insulation classification warning
- Loop leakage current detection and diagnosis
- Real-time communication status monitoring function
- Data upload and alarm output functions
- Calibration and configuration functions
- High-performance hardware
The host and collector use 32-bit industrial control CPUs and support up to dozens of CPUs running simultaneously. Each DC loop data acquisition channel uses an independent high-precision 16-bit AD converter, with a conversion speed of more than 1,000 times per second and a resolution of more than 1/50,000. The sensor resolution reaches 0.01m.
- Advanced architecture, Smart software, and Humanized interface
Application of ZJS-102 online insulation monitoring system
The ZJS-102 insulation monitor is widely used in DC Systems including DC power supply, DC load, DC loop, and related control and monitoring equipment. It is commonly used to monitor Grounding resistance and Insulation decreasing of DC bus and branch circuits in industrial or utility substations.
ZJS-102 Insulation Monitor Display
