Can the ZJS102 Insulation Resistance Monitor Alternative Bender iso685 and 421

Abstract: This article will introduce the insulation resistance monitor of ZJS102 from the definition, advantages, insulation resistance calculation, and comparison between ZJS102 and Bender IMD 421 & Bender iso65.

What is the ZJS102 insulation resistance monitor?

The ZJS102 Insulation Resistance Monitor cleverly integrates transient alarm waveform capture and current synchronous detection technology, allowing it to quickly and accurately record voltage and current fault curves. This insulation monitor can realize instantaneous grounding monitoring and also has the function of grounding fault location, providing a comprehensive guarantee for the safety of the power system.

The ZJS102 Insulation Resistance Monitor is functionally equivalent to the combination of Bender 421 and Bender iso 685. This means that ZJS102 integrates a comprehensive solution equivalent to the functions of Bender 421 and Bender iso685, providing more convenient and efficient monitoring and management capabilities for electrical systems.

Advantages of the ZJS102 insulation resistance monitor

Efficiency of multi-channel monitoring

The ZJS102 insulation resistance monitor has a wide operating voltage range from 0 to 300V, making it suitable for a variety of DC power system environments. Its built-in ZJS-CU collector unit supports the connection of up to 8 current sensors with a measurement accuracy of 0.1mA. Each record alarm list volume is up to 32 branches. This means that a single ZJS102 insulation monitoring device can support the monitoring of up to 240 branches, providing users with efficient system coverage and reducing the number of devices and maintenance costs.

Accuracy of insulation resistance monitoring

The main body of the ZJS102 insulation resistance monitor has the ability to detect the voltage at the fault point. Using the current and voltage values measured by the built-in CT collector, the insulation resistance can be calculated quickly and accurately. The measured resistance value ranges from 0 to 300K ohms. The insulation resistance monitor can accurately determine whether the insulation resistance is less than the set value, and then determine the branch where the fault occurs for early warning.

Example of ZJS102 insulation resistance monitor calculation formula

From figure 1, in feeder n, I5=Vss/Rx, consider CT accuracy is 0.1mA, system detect voltage 0-300Vdc, so V_i5 = Vss < 300V, for example, detected is 80V.

The calculated value is 80V/0.1mA=800Kohm, theoretical limit = 300/0.1mA=3Mohm.

P.S.

Bender 685 range 1-10Mohm due to detect system voltage 1000V, theoretical limit = 1000/0.1mA=10Mohm,

Bender IMD 421 CT response range 0.2-1mA, if same in 300V system, theoretical limit = 300/0.2mA=1.5Mohm.

Considering the current is not 0.1mA, the actual range will be less than 1Mohm, 300Kohm is enough.

Brief Comparison between ZJS102 and Bender iso 685 & Bender IMD 421

Products	ZJS102 Insulation resistance monitor	Bender iso 685 & Bender IMD 421
Function	Having the all-in-one function of Bender IMD 658 & 421	only having their own separate functions
Collector	Detect its own voltage autonomously with a Built-in collector	Requires additional products to perform own voltage detection
Insulation resistance calculation	The insulation resistance value is obtained through internal measurement, and the value within 300KOhm can be accurately calculated.	The support of external products is required to measure the value of insulation resistance.

Compared with the combination of Bender insulation monitor 421 CT and Bender iso685, the ZJS-CU collector in the ZJS102 Insulation Resistance Monitor comes with a CT with 0.1mA accuracy, which can detect its own voltage without the need for additional product support. Thus, this IMD electrical not only simplifies the system structure but also improves overall operability and cost-effectiveness.

To sum up, the ZJS102 Insulation Resistance Monitor has become the leading choice in DC power systems with its advanced technology and comprehensive functional advantages. The ZJS102 insulation monitoring system can offer you complete safety protection and assist the power system in achieving stable and dependable operation through effective instantaneous ground monitoring, the adaptability of multi-branch monitoring, and precise insulation resistance monitoring. If you need a comprehensive insulation monitoring solution at a factory price, the ZJS102 insulation resistance monitor can be your good choice in the place of Bender IMD 421 and Bender iso685.