GB/T 19826-2014General specification and safety requirements for DC power supply equipment of power projects (English PDF)

4.2.1 Rated voltage and frequency of AC input

4.2.2 Nominal voltage and frequency of AC output Three-phase voltage. 380 V,

50 Hz; Single-phase voltage. 220 V,

4.2.3 DC nominal voltage 220 V, 110 V, 48 V and 24 V.

4.2.4 Output DC rated current of charging unit As for the output DC rated current of charging unit, the following values may be preferred.

4.2.6 Boundary dimensions of products The boundary dimensions of products are specified in enterprise product standard; the following boundary dimensions (frame dimensions of panel/cabinet) may be preferred for panels and cabinets.

5.1 Ambient condition requirements

5.1.1 Standard limits of nominal ranges of influencing quantities and influencing factors

5.1.2 Other requirements of operating site

5.1.2.1 The operating site shall be free from vibration and impulse with severity exceeding Level 1 specified in GB/T 11287-2000 and GB/T 14537-1993.

5.2.1 Charging unit

5.2.1.1 Regulation range of charging voltage and current The regulation range of charging voltage and current for charging unit shall meet those specified in Table 2.

5.2.1.7 Equalizing current imbalance If multiple sets of the high-frequency switching power supply modules of the same model operate in parallel, each module shall be able to share the load equally in proportion. If the average output current of each module is 50 % ~ 100 % of the rated current, its equalizing current imbalance shall not exceed ± 5 %.

5.2.1.8 Soft start characteristic The charging unit shall be provided with soft start characteristic, and the soft start time may be set as required by the user; generally, this time is set as 3 ~ 10 s.

5.2.2 AC uninterruptible power supply and inverter supply

5.2.2.6 Voltage phase deviation The voltage phase deviation of AC uninterruptible power supply with three-phase output shall not exceed 3°.

5.2.2.7 Distortion of voltage waveform The distortion of output waveform shall not exceed 3 %.

5.2.3.3 Dynamic voltage transient range and transient response recovery time Dynamic voltage transient range shall not exceed ± 5 % of the nominal voltage and the transient response recovery time shall not be larger than 200 ms.

5.2.3.4 Noise voltage

5.2.3.6 Efficiency Under the rated load, the efficiency of DC switching power supply device shall not be less than those specified in Table 6.

5.2.4 Storage battery

5.2.4.1 Capacity of storage battery Where the capacity of storage battery set is tested under discharging current and end- of-discharging voltage specified in Table 7, the capacity of storage battery shall meet those specified in Table 7.

5.3.3.2 Voltage value for dielectric strength test. the positions listed in

5.3.3.1 shall withstand the power frequency voltage withstand test at (50 ± 5) Hz for 1 min (DC voltage may also be adopted but the test voltage shall be

1.4 times the r.m.s. AC voltage) without Table 9.

5.3.4 Impulse voltage Between any circuit of the product and the ground and between AC circuit and DC circuit, short-time impulse voltage tests with standard lightning wave shall be withstood. The test voltage shall be selected according to those specified in Table 9. The main functions of the product after impulse voltage is applied shall meet the standard requirements.

6.1 Test conditions

6.1.1 Ambient conditions Unless otherwise specified, tests shall be carried out under normal ambient conditions which refer to.

6.1.3 Terms of arbitration Dispute, if any, may be subjected to arbitration according to the reference conditions specified in

4.2 of GB/T 7261-2008.

6.1.4 Test instrument requirements Unless otherwise specified, the precisions of all instruments and apparatus used during tests shall meet the following requirements.

6.2 Structure and process inspections The 5.5 "Structure and process requirements" shall be checked according to the method specified in Clause 5 of JB/T 5777.3-2002.

6.3 Stabilized current precision, stabilized voltage precision and ripple factor tests

6.3.1 Test circuit diagram The wiring for the tests is as illustrated in Figure 1.

6.3.4.1 Oscilloscope requirements. with bandwidth of 20 MHz, scanning speed less than

0.5 s/div, and the measuring probe as close to the output terminal of the equipment to be tested as possible.

7.3 Type inspection

7.3.1 Under the following conditions, type inspection shall be carried out.

7.3.2 The type inspection items are detailed in Table 15.

7.3.3 For type inspection, take one sample randomly from the products having passed the delivery inspection.

8.1 Marking

8.1.1 Each set of products shall be provided with nameplate, which shall be mounted at an obvious position and shall indicate the following items.

8.1.2 All the switches, instruments, signal lights, alarm windows, power buses and control buses of the product shall be marked with corresponding letter symbols, which shall be consistent with those on the wiring diagram and shall be distinct, fadeless, shedding-proof, uniformly arranged and convenient for observation.

8.2 Packaging Product packaging shall be specified in the enterprise product standard.

8.4 Storage The product shall be stored in a ventilated warehouse without corrosive and explosive gases, with temperature controlled at -25 °C ~ +55 °C and monthly average relative humidity no greater than 90 %, and shall be free from rain, solarization, condensation and frost during storage.