Anti islanding protection device
Wbg-611 anti islanding protection device is a new cost-effective microcomputer protection device integrating protection, measurement, control and communication, which is carefully built for power users according to the needs of enterprises and the characteristics of power supply and distribution system to meet the needs of various small-scale photovoltaic power generation automation, on the basis of summarizing the development and research experience of power station automation system for many years, It is applicable to photovoltaic anti islanding protection and measurement and control of 0.4kV voltage level. Wbg-611 anti islanding protection device can be installed not only in low-voltage switchgear, but also in control room.
Anti islanding protection device
1.1 product features
N integrated metal fully enclosed chassis design, with strong dust-proof, corrosion-resistant and pollution-resistant ability;
N platform based whole movement design makes maintenance more convenient and greatly reduces the shutdown time of the protected object;
N. the device and operating power supply flexibly support AC and DC power supply (AC220, DC220);
N powerful message storage function, which can record the latest 32 protection action reports;
N wbg-611 protection device provides local monitoring function with friendly interface to meet the different requirements of on duty and relay protection personnel;
N the main CPU adopts high-speed 32-bit DSP (digital signal processor) chip;
N 128 × 64 dot matrix LCD with rich and clear display content and beautiful appearance;
N the hardware and software design are modular, which is easy to upgrade and expand functions.
Anti islanding protection device for distributed photovoltaic power generation
Anti islanding protection device
1.2 main technical parameters
1.2.1 rated data
AC / DC power supply: 220V, allowable deviation + 15%, - 20%
AC voltage: 100V, 57.7v
AC current: 5A, 1A
Frequency: 50Hz
1.2.2 power consumption
AC voltage circuit: ＜ 0.5va/phase (under rated voltage)
AC current circuit: ＜ 0.5va/phase (in = 1a)
＜ 1va / phase (in = 5a)
DC circuit: normal ＜ 15W
Trip ＜ 25W
1.2.3 measurement level of remote measurement
Current: level 0.2
Others: grade 0.5
1.2.4 remote signaling resolution
Less than 2ms.
1.2.5 signal input mode
Passive node.
1.2.6 analog input
After the external current and voltage inputs are isolated and transformed by the isolation transformer, they are input to the analog-to-digital converter by the low-pass analog filter. After sampling and digital processing, the CPU forms various protection relays and calculates various remote measurements.
The protection current passes through the protection CT of the device, and the voltage signals (UA, UB, UC) pass through the Pt and are converted into voltage signals. After passing through the low-pass filter, anti-interference device, protection circuit and operational amplifier, they are input to the a/d converter that can input ± 10V, converted into digital signals and enter the CPU for protection after operation. The measurement CT is obtained through the internal amplification of the protection CT. The voltage UA is also used as the input of the frequency measuring circuit.
The input voltage and electric flow of each device are different, but the principle is the same. Only the input analog quantity is listed in the device description part.
Anti islanding protection device for distributed photovoltaic power generation
Anti islanding protection device
1.2.7 overload capacity
(1) AC current circuit: 2 times of rated current for continuous operation; 10 times of rated current for 10s; 20 times of rated current for 1s.
(2) AC voltage circuit: 1.2 times of rated voltage for continuous operation.
(3) Power circuit: 80% - 120% rated voltage, normal operation.
1.2.8 insulation performance
(1) The insulation resistance between all circuits and the shell shall be less than 100m Ω under standard experimental conditions.
(2) The dielectric strength between all circuits and enclosures can withstand the test with AC 50Hz, voltage 2KV (effective value) and duration of 1min without insulation breakdown or flashover.
1.2.9 anti interference performance
(1) Between the terminals of power circuit, AC input circuit, input circuit and output circuit and the exposed non-conductive metal shell, it can withstand the short-time impact test of standard lightning wave with amplitude of 5kV under the specified test atmospheric conditions.
(2) 1MHz and 100kHz oscillation wave interference: comply with GB / T17626 12-1998 "oscillation wave immunity test" (equivalent to iec61000-4-12:1995), level 4 of ringing wave test and level 3 of damped oscillation wave test (both are the highest levels).
(3) Surge interference: comply with GB / T17626 5-1999 surge (impact) immunity test (equivalent to iec61000-4-5:1995) level 4 (4KV) standard.
(4) Anti electrostatic discharge interference: comply with GB / T17626 2-1999 electrostatic discharge immunity test (equivalent to iec61000-4-2:1995) class 4 (8Kv) standard.
(5) Anti fast transient burst interference: comply with GB / T17626 4-1998 fast transient burst immunity test (equivalent to iec61000-4-4:1995) class 4 (power circuit 4KV, signal circuit 2KV) standard.
(6) Anti pulse magnetic field interference: in accordance with GB / T17626 9-1998 impulse magnetic field immunity test (equivalent to iec61000-4-9:1993) class 5 (1000A / M) standard.
(7) Anti amplitude radio magnetic field interference: in accordance with GB / T17626 3-1998 radiated magnetic field immunity test (equivalent to iec61000-4-3:1995) class 5 (10a / M) standard.
(8) Environmental conditions
U working temperature: - 10 ℃ ~ 70 ℃
U storage temperature: - 40 ℃ ~ 85 ℃
U after the storage temperature is restored to the working temperature range, the device works normally. No excitation is applied and there is no irreversible change.
1.2.10 reliability index
MTBF (mean time between failures): > 30000h;
MTTR (mean time to repair): ＜ 3.5H;
Anti islanding protection device for distributed photovoltaic power generation
Anti islanding protection device
Tech Support
User Reviews
