Q96-MΩA Q72-MΩA Q96-ZMΩA Q72-ZMΩA Isolation monitor for AC grid

                                           Q96-MΩA Q72-MΩA Q96-ZMΩA Q72-ZMΩA Isolation monitor for AC grid

Overview

Monitor the insulation resistance of AC power grid below 500V, and output an alarm signal when the insulation resistance of power grid is lower than the set value. When the insulation resistance of the power grid is lower than the set value, an alarm signal is output. Deflection angle: 90 ° 

Q96-MΩA Q72-MΩA Q96-ZMΩA Q72-ZMΩA Isolation monitor for AC grid is used to conduct on-line monitoring and indication of the grounding insulation resistance of the ungrounded AC power grid below 500VAC under the condition of continuous power supply. When the insulation resistance value of the AC power grid is lower than the set alarm setting value, the indicator light of the insulation monitor is on and outputs a relay conversion contact signal at the same time, For external reports.

This product has excellent performance and excellent resistance to mechanical force and environment and climate. The product has reasonable structure, integrated monitoring and indication and small volume, which makes the product structure more reasonable and compact, further improves the reliability of the product, and makes the installation and wiring of users more convenient

Working principle of Q96-MΩA Q72-MΩA Q96-ZMΩA Q72-ZMΩA Isolation monitor for AC grid

The existing detection methods mainly include bridge balance principle and low-frequency detection principle. The insulation monitoring device based on the principle of bridge balance is widely used, but it can not detect the situation when the positive and negative insulation of DC system drops equally; Even if the insulation monitoring device gives an alarm, it cannot directly obtain the insulation resistance of the system to the ground. Using the low-frequency detection principle to detect the grounding fault is a new method adopted in recent years, but the grounding resistance it can detect is restricted by the distributed capacitance of the DC system to the ground, and the low-frequency AC signal is easy to be disturbed by the outside world. In addition, the injected low-frequency AC signal increases the voltage ripple coefficient of the DC system. It can be seen that both the bridge balance principle and the low-frequency detection principle have some insurmountable defects. This paper presents a new detection method, that is, the main circuit uses unbalanced bridge to detect the total insulation resistance, while the branch uses DC transformer to detect which circuit has insulation reduction. At the same time, this detection method is realized by single chip microcomputer.

Instructions of Q96-MΩA Q72-MΩA Q96-ZMΩA Q72-ZMΩA Isolation monitor for AC grid

● after the instrument is correctly connected as shown in Figure 1 and figure 3, before use, first observe whether the instrument pointer is on the mechanical zero position (∞ position) of the scale in case of power failure, otherwise adjust it; When the power is turned on, the green indicator on the front panel of the instrument is on, which means that the instrument starts to work.

1. There is a toggle switch on the back of the instrument (see Figure 2), and its functions of each gear are as follows:

a. "Self inspection" gear: when the toggle switch is turned to this gear, the instrument will indicate at 10K Ω position; after a slight delay, the red indicator light will be on, and the output normally open and normally closed contacts will change, indicating that the instrument is working normally.

b. "10K Ω" gear: the set value of instrument alarm. When the insulation resistance of the tested network is lower than this set value, an alarm action will occur. At this time, the red alarm light will be on, and a conversion contact signal will be output for extension alarm.

c. "30K Ω" and "60K, 100k": the same as B.

● when the ship uses shore power, because the shore power system is a grounding system, the instrument will send an error, so the connection between the detection end of the instrument and the system should be cut off

Main tech data of Q96-MΩA Q72-MΩA Q96-ZMΩA Q72-ZMΩA Isolation monitor for AC grid

Ambient temperature: - 25 ℃ to + 55 ℃

Enclosure protection: ip42 / 52

Vibration resistance: 0.7G

Front panel size: 96x96mm

Accuracy level: 1.5

Rated voltage: UN ± 15% (UN: 220V, 380V)

Power consumption: ≤ 5VA

Alarm accuracy: 10K Ω + 20%, 30K Ω ± 20%, 60K Ω ± 10%, 100k Ω ± 10%

200kΩ＋10%, 300kΩ±10%, 500kΩ±10%, 1MΩ±10%

Switching capacity: 250VAC 5A

Measuring range: 0～5MΩ

Rated voltage: 220Vor/and 380V

Note: Any special design or question of Q96-MΩA Q72-MΩA Q96-ZMΩA Q72-ZMΩA Isolation monitor for AC grid , kindly contact the manufacturer for more details.