1. Product overview

The CG2832 series is an intelligent monitoring device designed for American-style box-type transformers used in the special working environments of wind farms and photovoltaic power plants. It integrates the monitoring of various electrical parameters such as current, voltage, frequency, power factor, power, and energy meters. It meets the "minimally attended" operational management requirements of box-type transformer projects, enabling comprehensive monitoring of low-voltage side information, non-electrical protection, and remote control functions, and it supports the intelligent management, operation and maintenance of power systems.

2. Functions & features

·Multi-parameter fusion monitoring

Two independent channels for monitoring electrical parameters such as current, voltage, frequency, power factor, power, and energy.

It can acquire 19 channels of passive dry contact inputs, including standard switching signals such as load switch position, grounding knife switch position, low-voltage side switch position, etc.

• High reliability and scalability

Wide temperature operation: -40℃ to +85℃, electromagnetic interference resistance level IV, insulation resistance of 100MΩ/500V.

Provide 5 channels of relay dry contact output, optionally with 1 channel of 4–20mA DC analog input and 3 channels of PT100 temperature acquisition.

· Intelligent diagnosis and early warning

It can realize heavy gas tripping, light gas actuation alarm, SF6 abnormal pressure alarm, transformer high temperature alarm, transformer ultra-high temperature tripping, transformer low oil level warning, etc.

· Remote centralized control and compatibility

Meet the self-healing ring fiber optic Ethernet communication requirements for box-type substations.

The communication protocol adopts standard MODBUS protocols, DNP3.0 or IEC 60870-5-101.

It can be easily integrated with the box-type substation's comprehensive automation system.

3. Technical specifications

Working environment temperature: -40℃～+85℃

Storage environment temperature: -45℃～+85℃, relative humidity not more than 85%. It should be stored in a rainproof and snowproof room. The surrounding air should not contain acidic, alkaline or other corrosive and explosive gases.

Relative humidity: The relative humidity shall not exceed 50% when the maximum temperature is +75℃; higher relative humidity is allowed at lower temperatures, for example, up to 90% at 20℃. Special measures shall be taken for occasional condensation caused by temperature changes.

Insulation performance: insulation resistance 100MΩ/500V; dielectric strength test: insulation test: 2kV (r.m.s), 50Hz, 1min

Electromagnetic compatibility (EMC)

Electrostatic discharge immunity test: EN 61000-4-2 and GB/T17626.2-1998 Class IV

Radiated RF electromagnetic field immunity test:     EN 61000-4-3 and GB/T17626.3-1998 Class III

Electrical fast transient burst immunity test:   EN 61000-4-4 and GB/T17626.4-1998 Class IV

Surge immunity test (1.2/50μs): EN 61000-4-5 and GB/T17626.5-1998 Class IV

Electromagnetic emission test: GB/T 14598.16-2002

Rated measurement parameters: AC current 5A

AC Voltage: photovoltaic systems: AC 380V; wind power systems: AC 690V

AC frequency: 50Hz or 60Hz

Rated parameters of the monitoring and control device: working voltage: AC/DC 85~220V, rated power consumption not more than 10W, switch input passive switch contacts, the use of all switch contacts can be defined by users.

Control relay output: AC250V, 5A

Signal relay output: AC250V, 5A

Measurement accuracy: Current: 10%~120% with an accuracy of Class 0.5, Power:   0～500kW with an accuracy of Class 1.0

          Voltage: Class 0.5, 10%～120% with an accuracy of Class 0.5; temperature: -20～120℃±1℃

          Frequency: 45Hz～65Hz, not more than 0.02Hz Power factor: 0～1 with an accuracy of 1.0

Communication function: 1-channel RS485 or 10/100Base-Fx (self-healing optical port), single-mode or dual-mode optional.

4. Applications

It is an intelligent monitoring device designed for American-style box-type transformers used in the special working environments of wind farms and photovoltaic power plants.