SN-CM highly integrated intelligent capacitor

1 Product selection

The product models of the 1.1SN series intelligent power capacitors are shown in Figure 7, indicating the type of product.

1.2 Example 1: SN-CMS/450-10.20 represents a three-phase intelligent power capacitor with a total capacity of 30Kvar and a rated voltage of 450V. The first circuit is 10Kvar and the second circuit is 20Kvar.

Example 2: SN-CMF/250-30 represents a single-phase distributed intelligent power capacitor with a total capacity of 30Kvar and a rated voltage of 250V. The capacity of each phase, a, b, and c, is 10Kvar.

1.3 Three phase compensation method: The product contains two "△" type capacitors with a maximum capacitance of (35+35) Kvar. The two capacitors do not switch on or off simultaneously during operation; The phase separation compensation method product has a "Y" type capacitor, with A, B, and C phases being switched on and off respectively. The internal capacitor capacity of three-phase compensation products can be the same or different, such as (20+20), (20+10), (10+10), (10+5) Kvar, etc.

1.4 Capacitors are the most vulnerable components in terms of voltage tolerance in products, so the selection of rated voltage should have a large safety margin. The product is generally installed at the outlet of the distribution transformer, where the voltage is relatively high. The compensation method U is preferredNtake450V、 Phase compensation method UN250V is better.

2. Schematic diagram of ordinary product terminals

3 ordinary product installation dimensions

Universal product

Weight: 7.0 ± 0.2Kg (20+20) Kvar

Dimensions: Fixed installation dimensions as shown in the diagram

The quality of products varies with different specifications, but the external dimensions, spacing between fixing holes, and size of fixing holes are the same.

4 Common product specifications

Technical specifications of 5 products

5.1 Power Supply Conditions

Rated voltage:~220V/380V Voltage waveform: sine wave, total distortion rate not exceeding 5%

Voltage deviation: ± 20% Power frequency: 48.5~-51.5Hz

Voltage waveform: Current harmonics not exceeding 10% Power consumption:<1W (when capacitor is removed)

＜1W( When investing two capacitors)

5.2 Measurement Error

Voltage: ≤ 0.5%

Current: ≤ 0.5%

Power factor: ≤± 1.5%

Temperature: ± 1 ℃

5.3 Environmental conditions

Environmental temperature: -40~40 ℃

Relative humidity: 40 ℃, 20-90%

Altitude: ≤ 2000m

5.4 Error Protection

Voltage: ≤ 0.5%

Current: ≤ 0.5%

Temperature: ± 1 ℃

5.5 Reliability Parameters

Control accuracy: 100%

Control allowable frequency: 1 million times

5.6 Electrical Safety

The electrical clearance and creepage distance, insulation strength, safety protection, short-circuit strength, and the use and control circuit protection all comply with the power industry standard DL/T842-2003 "Conditions for the Use of Low Voltage Parallel Capacitor Devices" of the People's Republic of China GB/22582-2008

The corresponding clause requirements in the "Power Factor Compensation Device for Low Voltage Power Capacitors".