DC composite outdoor terminal

Application areas:

It is mainly used in the field of flexible high-voltage direct current transmission. It has gained widespread attention due to its flexible and variable operating power range, independent operation, simple power direction control and superior transmission performance.

Product Description

Product Model: DC-ZWF-□kV-□mm2

Composite sleeve-type external terminals use glass fiber reinforced epoxy resin air sleeves instead of traditional porcelain sleeve insulation tubes, offering better shock resistance, explosion protection, and insulation compared to traditional materials. They are suitable for use in urban centers, areas with dense equipment, and areas requiring protection from flying debris. The insulation level, current carrying capacity, and operating temperature of this terminal fully meet the requirements of the cables it is used with.

The terminal stress cone is made of imported EPDM rubber by high-pressure injection molding and is held in place by a spring cone support. The stress cone cover structure isolates the stress cone from the insulating filler, which overcomes the defects of elastic relaxation caused by material aging and poor contact between the stress cone and the outer semiconducting layer of the cable, thus ensuring the long-term safe and stable operation of the terminal.

The composite sleeve uses silicone rubber skirts as outer insulation, which has good stain resistance, UV resistance, aging resistance and explosion-proof performance.

The terminal adopts a multi-layer sealing structure to prevent water seepage, oil leakage and other phenomena during operation.

Product Parameters

1. VSC Load Cycling Test: The load cycle includes a heating cycle and a cooling cycle; 8 hours of heating followed by 16 hours of natural cooling constitutes one cycle. During the last two hours of the heating cycle, the conductor temperature is maintained at 70°C. The DC voltage UT during heating starts from the negative polarity. One reversal coincides with the load current stop time in the 24-hour load cycle. Each cycle is applied for 12 consecutive times.

2. VSC superimposed impulse voltage test (test conducted under thermal conditions):

2.1 DC superimposed operating impulse voltage test:

Preheat and apply a positive polarity U0 voltage for at least 10 hours; under positive polarity U0, superimpose a positive polarity operating impulse voltage Up2,S for 10 consecutive times; under positive polarity U0, superimpose a positive polarity operating impulse voltage -Up2,O for 10 consecutive times.

Preheat and apply a negative polarity U0 voltage for at least 10 hours; under negative polarity -U0, superimpose a positive polarity operating impulse voltage -Up2,S for 10 consecutive times; under negative polarity -U0, superimpose a positive polarity operating impulse voltage Up2,O for 10 consecutive times.

2.2 DC superimposed lightning impulse voltage test:

Preheat and apply a positive polarity U0 voltage for at least 10 hours; then superimpose a negative polarity lightning impulse voltage -Up1 for 10 consecutive times.

Preheat and apply a negative polarity -U0 voltage for at least 10 hours; then superimpose a positive polarity lightning impulse voltage Up1 for 10 consecutive times.

2.3 Subsequent DC voltage test

Exposed to a negative polarity voltage -UT at room temperature for 2 hours.

Rated voltage		±150kV	±320kV
VSC load cycling test	UT	277.5	592
DC superposition operation impulse voltage test	U0	150	320
	Up2,S	450	700
	Up2,O	290	700
DC superimposed lightning impulse voltage test	U0	160	320
	Up1	400	480
DC voltage test	UT	277.5	592

Rated voltage	kV		±320
Technical parameters
Meets standards			1. National Power Grid Conference Standard CIGRE 419 2. TICW7-2012 Test Specification for Extruded Insulated Power Cables for DC Transmission with Rated Voltage of 500kV and Below
Rated current	A		Not smaller than the connecting cable
short circuit current			Not smaller than the connecting cable
conductor connection			crimp type
Electric field control method			Geometric method
Insulating filler			silicone oil
creepage distance	mm		>7812
Applicable cable cross-section	mm2		400-2500
weight	Kg		750
Applicable cable shielding/sheath
Operating environment
conductor rated temperature	During normal operation	℃	90
	Short circuit	℃	250
Suitable ambient temperature range	℃		-40-60
Altitude of the area of ​​use	m		3000
Permissible seismic intensity at the terminal	Spend		8
The terminal allows for horizontal tensile force on the connecting wires.	kN		2
Bending strength	kN∙m		20
Maximum internal pressure	MPa		2

We are committed to continuous product improvement, therefore we reserve the right to change designs, sizes, and data without prior notice.

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