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Help CenterPrinciple of Yiyang Capacitor Vst500-480-30-b
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Product Features
a. Dry design, high reliability, and excellent self-healing performance.
b. Excellent explosion-proof performance, mechanical explosion-proof structure. When the capacitor fails, it only shows an open circuit.
c. Beautiful appearance, easy to install, frosted shell, never rusts.
d. Capacitors under the same voltage level can be combined into various capacitance values.
Reference Standards
National Standard: GB12747-2004
American Standard: UL810-1998
Standard: IEC60831-1.2-1996 (International Electrotechnical Commission Standard)
Performance Indicators
Rated Voltage: 250V, 450V
Rated Frequency: 50/60HZ;
Recommended Optional Capacitance Range for a Single Unit:
1Kvar～40Kvar;
Capacitance Accuracy: -5%～+10%;
Operating Voltage: Below 110% of the rated voltage
Dielectric Loss: ≤0.0025.100HZ
Withstand Voltage: Between electrodes: 2.15Un/10s
Between electrode and shell: 3000VAC/10s
Internal Connection Method: △ type or Y type
Operating Conditions
Temperature Range of the Working Environment: -40℃～+60℃
Relative Humidity: 90%
Altitude: 2000m
Overvoltage: 1.1Un for a long time;
1.15Un for no more than 8 hours per day;
1.3Un for no more than 1 hour per day.
: The schematic diagram of the glow discharge quenching type SF6 leak detector is shown in Figure 5. In the figure, the potential at point a is affected by the gap discharge situation. As long as the potential change at point a is measured, the SF6 gas content can be qualitatively known and whether there is a leak can be determined. First, the laser system emits infrared laser (the reason for using infrared light is that SF6 gas can effectively absorb in the infrared spectral region), which is incident on the object in the detected area and reflected on the object surface. The reflected light returns to the detection device along the original optical path. Application Areas
Smart Reactive Power Compensation Capacitors provide solutions for improving the power supply power factor and enhancing the power grid efficiency.
The main application areas are:
■Residential community power distribution systems
■Municipal commercial buildings
■Traffic tunnel power distribution systems
■Box-type substations, complete cabinets, outdoor distribution boxes
Meanwhile, semiconductor dehumidifiers are lightweight and can be used anywhere you need, and basically produce no noise. Semiconductor dehumidifiers use semiconductor materials to control humidity, but they have no compressors, so their dehumidification effect is not obvious in large environments. Therefore, when buying a dehumidifier, you must pay attention to the humidity at home. If the humidity at home is relatively high, the dehumidification effect of the semiconductor dehumidifier may not be ideal. According to everyone's request, I'll share how to write a timed shutdown function using Delta PLC. I once encountered a project where we could set the shutdown time to a specific year, day, time, and minute. However, later practice taught us that if the equipment loses power due to some reasons one day, the PLC has no power and the program cannot run, which directly results in the equipment not shutting down on that day but on the next day. So we learned from this lesson and directly changed it to monthly shutdown, and it will definitely shut down on the 1st of each month. But if the customer requests otherwise, it can be set through the touch screen to make it work again.
Technical Parameters
The smart capacitor integrates a smart control module, a fast switching switch, and capacitor protection. It has a delicate design structure and can be flexibly configured to meet the user's needs for reactive power compensation. The comparison between the reactive power compensation system composed of smart capacitors and that composed of conventional capacitor products is shown in Table 1 below.
| | Reactive power compensation system composed of conventional capacitors | Reactive power compensation system composed of smart capacitors |
| Reactive power compensation device | Conventional capacitors, fuses, composite switches or mechanical contactors, thermal relays, smart controllers | Smart capacitors (used independently or multiple units connected online) |
| Control method | Automatic control or manual control | Automatic control or manual control, achieving zero-crossing switching (no need to configure a controller for automatic control) |
| Parameter measurement | Measure voltage, current, reactive power, power factor | Measure voltage, current, reactive power, power factor, three-phase currents of each capacitor, and the internal temperature of the capacitor |
| Status monitoring | Capacitor switching status, over/under compensation status, over/under voltage status | Capacitor switching status, over/under compensation status, over/under voltage status, protection action type, self-diagnosis fault type |
| Protection type | Instantaneous overcurrent protection, overcurrent protection, overvoltage protection, undervoltage protection | Instantaneous overcurrent protection, overcurrent protection, overvoltage protection, undervoltage protection, capacitor over-temperature protection, phase loss protection, three-phase unbalance protection |
| Human-machine dialogue | Digital tube and buttons | Display interface and buttons, rich in information content |
| Installation and use | There are many types and large quantities of components, and the structure is complex. | The product has a simple structure, and the installation and wiring are simple and convenient. |
| System composition and expansion | The product is designed as a whole, requiring a one-time investment. It is difficult to adjust the compensation capacity after the product is formed. | The product is modularly designed, and the compensation capacity can be easily expanded. Staged investment can be realized. |
| Appearance and weight | Large volume and very heavy weight | Exquisite structure and light weight. It can be directly installed in the power distribution cabinet. |
| Reliability analysis | There are many types and large quantities of components. A controller failure will cause the entire compensation system to fail. | Intelligent capacitors automatically form a system to work. If a single intelligent capacitor fails, it will automatically withdraw from the system without affecting the operation of other intelligent capacitors. The system has high reliability. |
Current transformer BDCTAD-01-40A Contactor YDC1-150M/Y
Circuit breaker BM30-125/80 Residual current circuit breaker PHKKM1L-350M/4P
Fast fuse HDLRS0-350
Heater DJ2-150S Circuit breaker TGB1N
Circuit breaker FEN160-125 Switch DR-75-24
Hall current sensor JLKT-24 Contactor ZJHG-8011M
Small current grounding line selection device SD-SLCH-36A Contactor RH59-75A
Reactor CELR62/690-6/64A Digital display instrument XJZC-03A/Q Motor protector PMW617E-A63-I
Temperature and humidity controller DWS-11DX-2W Digital display instrument KCXM-2011P2S
Output filter OH_200A Current transmitter Hpa-A2-f1-p2-03
Three-phase four-wire smart meter DTSD342-5N Electric quantity transmitter S3-AD-1T-55A4B CP-E72A, Three-phase Three-phase Active Energy Meter DS862, Voltmeter PZ195U-9X1
Multi-functional Power Meter 6NTPM810, Filter-type Capacitor LZS-DLC30
Control and Protection Switch KB0-12C/M16/06M, Overvoltage Protector FV-3
Backup Protector CQ-SCB100, Current Transmitter PLDD-I
Overvoltage Protector YH5WZ1-51/150*51/134J, Earthing Switch ESW-1212, Overvoltage Protector ELGB-B-12.7/131
Controller QP470C, Motor Protector JYB-25/W38-100A
Thermostat XMTE6000, Thermal Relay EWT200B/12.5-18A
Signal Isolator DFP-1100, Dual-channel Humidity Controller YQS2K-Z48
High-voltage Fuse WFNH0-7.2KV/80A
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