Technology of Electrical Automatic

GYDCG-UBCS1 Series Insulation Monitoring Relay

GYDCG-UBCS1 Series Insulation Monitoring Relay

The GYDCG-UBCS1 Series Insulation Monitoring Relay has two models: standard GYDCG-UBCS1 and GYDCG-UBCS1-ST. Both of them have basic functions such as insulation resistance monitoring, DC voltage monitoring, and DC voltage reverse connection alarm, while the GYDCG-UBCS1-ST insulation monitoring relay has insulation monitoring module internal self-test, and DC positive and negative pole to ground voltage monitoring.

  • Real-time monitoring of the ground insulation resistance value of 100 ~ 1000 Vd.c. DC floating system.
  • Real-time monitoring of 0 ~ 1000 Vd.c. DC voltage value.
  • RS485 communication, standard MODBUS RTU protocol.
  • DC voltage reverse connection alarm function.
Category:

The GYDCG-UBCS1 Series Insulation Monitoring Relay has two models: standard GYDCG-UBCS1 and GYDCG-UBCS1-ST. Both of them have basic functions such as insulation resistance monitoring, DC voltage monitoring, and DC voltage reverse connection alarm, while the GYDCG-UBCS1-ST insulation monitoring relay has insulation monitoring module internal self-test, and DC positive and negative pole to ground voltage monitoring.

  • Real-time monitoring of the ground insulation resistance value of 100 ~ 1000 Vd.c. DC floating system.
  • Real-time monitoring of 0 ~ 1000 Vd.c. DC voltage value.
  • RS485 communication, standard MODBUS RTU protocol.
  • DC voltage reverse connection alarm function.
Category:

Overview

GYDCG-UBCS1 Series Insulation Monitoring Relay is used in DC systems such as electric vehicle DC charging systems, photovoltaic systems, energy storage systems, and DC power grids.

application GYDCG-UBCS1 Series Insulation Monitoring Relay

Feature of the insulation monitoring relay

  • Widely power supply range (10-30V)
  • Widely insulation monitoring range (100V~1000VDC)
  • Insulation monitoring equipment self-test
  • Adaptive capacitance to ground
  • Convenient parameter setting
  • Remote monitoring and management
  • Monitor positive and negative poles
  • Ground insulation resistance
  • Voltage reverse polarity alarm
  • Real-time monitoring of insulation resistance
  • Din Rail mounting or screw fixing.
  • Insulation monitoring equipment self-test
  • RS485 remote monitoring and management
  • The internal resistance of the insulation monitoring module to ground is 3MΩ or 600KΩ.
  • Monitoring accuracy can be as high as within 1%.

 

Working principle of GYDCG-UBCS1 Series Insulation Monitoring Relay

The GYDCG-UBCS1 insulation monitoring relay adopts the bridge method circuit, as shown in the figure below. After the insulation monitoring is powered on, the grounding switch K is turned off by default. After the insulation monitoring is turned on, the grounding switch K is closed, and the insulation resistance value of the positive and negative poles to the ground or the voltage value of the positive and negative poles to the ground can be read. When the insulation monitoring is turned on, the low voltage or insulation resistance data is updated in real time. The update period of the positive and negative insulation resistance data is 0.7s~2s, and the update period of the positive and negative electrodes to ground voltage is 100ms. After the insulation monitoring is turned off, the grounding switch K is opened, and thereafter it has no valid value for low voltage or insulation resistance.

working principle of DYDCGUBCS1 DC insulation monitoring relay

Difference between standard GYDCG-UBCS1 and GYDCG-UBCS1-ST

The main difference is that GYDCG-UBCS1-ST has internal self-test and two working modes. The details are in the following:

1. The two working modes of GYDCG-UBCS1-ST insulation monitoring relay are Automatically switch to bridge mode or fixed bridge mode.

Automatic switching bridge mode means that the insulation monitor automatically switches the internal positive and negative poles to ground resistance (RP and RN). This mode monitors the insulation resistance to ground. After the relay is powered on, the default is automatic switching bridge mode.

Fixed bridge mode means that the internal positive and negative pole-to-ground resistances (RP and RN) of the insulation monitor are fixed values. This mode monitors the positive and negative pole-to-ground voltages.

2. Internal self-test of GYDCG-UBCS1-ST

When the DC voltage is ≥100V and the module is turned off, the module will automatically perform self-test on its internal circuit (no control required) with a self-test period of 5 seconds. When the sampled value of the bridge voltage matches the bridge resistance value, it means that the self-test is qualified. You can determine whether the current device self-test is qualified by reading Bit4 of the 0x0014 register. If the self-test is qualified, it is “1”; if it is not qualified, it is “0”. If the self-test results are not updated, the last result will remain unchanged.

Specifications

Parameter Value
Power supply 10-30VDC, Power 3w
DC voltage range 0V~1000V
DC voltage

measurement accuracy

≤2V+0.3%
Insulation resistance

measurement range

1KΩ~10 MΩ

(DC System voltage:100V~1000V)

Insulation monitoring accuracy

((When :DC voltage:100V-1000V)

CY range Resistance range Accuracy
0~0.8μF ≤60kΩ ≤3kΩ
60kΩ<R≤1MΩ ≤5%
0.8μF ~3μF ≤60kΩ ≤6kΩ
60kΩ<R≤1MΩ ≤20%
Off-line pressure test <2mA
Standard IEC 61851-23 (2014-03):2014-11
Humidity 85%
Storage temperature – 40°C ~125°C
Operating temperature – 40°C ~75°C
Pressure point Maximum voltage rating Time
DC+/DC- To GND 4200VDC/3000VAC ≤1min
Power supply +/- To GND 3500VDC/2500VAC ≤1min
RS485 A/B To GND 3500VDC/2500VAC ≤1min
DC+/DC- To Power supply +/- 3500VDC/2000VAC ≤1min
DC+/DC- TO A/B 3500VDC/2000VAC ≤1min

Typical wiring

 

 

Dimension

 

Downloads

Brochure of IMD-SERIES-DC-INSULATION-MONITORING-DEVICES

GYDCG-UBCS1 Series User manual- V1.10

GYDCG-UBCS1-ST-User Manual-V1.11

 

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