66kv Fully Prefabricated Type Insulating Joint

Product Description

66-220kV High Voltage Cable Accessories
Our company provides the voltage level of 48/66kV, 64/110kV, 127/220kV and other series of cable accessories are all in accordance with IEC 60502, IEC 60840, IEC 62067, IEC 60859, IEC 62271-209, GB/T 11017, GB/T 18890, GB/T 12706, GB 311, GB 772, DL508, DL509, JB/T8144 and other standards, and have passed the stringent factory test, type test, pre-qualification test.
One piece pre-molded straight joint/sectionalizing joint
Scope of application
For cross linked polyethylene insulated power cables 240-3000mm2.
Suitable for large-scale chemical industry, iron and steel, power substations, coastal areas.
Features
The main body is a monolithic prefabricated structure, i.e. insulation, shielding and stress cone in one piece.
The stress cone is made of imported liquid silicone rubber injection molding, with a long and stable holding force and electric field uniformity.
Compact structure, small size, light weight, easy to install.
The shell is protected by an insulated, magnetically isolated metal protection box with good mechanical properties and good sealing.
Structure & Size
1,glass fiber
2,copper shell
3,stress cone
4,insulation of cable
5,epoxy insulating insulation
6,connecting pipe
7,shielding tiles
8,prefabricated body
9,coaxial cable
10,cable

Size / mm	38/66kV	50/66kV	64/110kV	76/132kV	127/220kV
L	1300	1300	1500	1500	1800
A	1900	1900	2100	2100	2400

Test Specification
All test classifications and codes:

No.#	Test Name	Code
1	Routine test	R
2	Sample test	S
3	Type test	T
4	Pre-qualification test	P
5	Additional test	A

The following routine tests are performed on stress cones, epoxy bushings of GIS terminals and prefabricated intermediate joints of each product at 66kV and above.

Item	Voltage
	38/66kV	50/66kV	64/110kV	76/132kV	127/220kV
Partial discharge	54kV, no detectable local discharge over background	72kV, no detectable local discharge over background	96kV, no detectable local discharge over background	114kV, no detectable local discharge over background	190kV, no detectable local discharge over background
The power frequency withstand voltage	90kV/30min	125kV/30min	160kV/30min	190kV/30min	318kV/30min
Sealing	Seal fittings, porcelain bushings, composite bushings for 0.25±0.01MPa/1h, no leakage
	The epoxy casing was subjected to 0.6~0.7MPa/1h with no leakage.
Appearance	The products are free of damage, cracks, and other defects that may affect the quality and appearance of the products.

66-220kV Main Test Parameters

Item	Standard			Test Category	Product Category
	48/66kV	64/110kV	127/220kV		Porcelain Sleeve Terminal	Composite Sleeve Terminal	GIS terminal	Straight / Insulated Joint	flexible terminal
Sealing Fittings, Porcelain, Composite Sleeves	0.25±0.01MPa/1h, no leakage			R	yes	yes	yes	-	-
Epoxy Sleeve	0.6~0.7MPa/1h, no leakage
Partial discharge of prefabricated parts	72kV	96kV	190kV	R	yes	yes	yes	yes	yes
	Detects no more than background discharge
Frequency withstand voltage of prefabricated parts	120kV	160kV	318kV	R	yes	yes	yes	yes	yes
	30min,no flashover, no breakdown
Partial discharge at room temperature	72kV	96kV	190kV	T	yes	yes	yes	yes	yes
	Detects no more than background discharge
Thermal cycling voltage test	96kV	128kV	254kV	T	yes	yes	yes	yes	yes
	20 cycles, no flashover, no breakdown
Partial discharge test at high temperature	72kV	96kV	190kV	T	yes	yes	yes	yes	yes
	Detects no more than background discharge
Lightning impact test and subsequent frequency withstand voltage test	450kV	550kV	1050kV	T	yes	yes	yes	yes	yes
	10 times for each positive and negative polarity
	120kV	160kV	318kV
	15min, no flashover, no breakdown
Directly buried joint outer protective layer immersion voltage test	Two ends impact among the 60/75kV,an end of hit 30/37.5kV		Two ends impact among the 60/95kV,an end of hit 30/47.5kV	T	-	-	-	yes	-
Sealing test after assembly of accessories	0.25±0.01MPa/1h, no leakage			T	yes	yes	yes	yes	yes
Outdoor terminal rain frequency voltage test	140kV	185kV	460kV	T	yes	yes	-	-	yes
	1min, no flashover, no breakdown
Pillar insulator voltage test	20kV/1min, no flashover, no breakdown			T	yes	yes	-	-	-
Radio interference test for outdoor terminals	61kV	81kV	140kV	A	yes	yes	-	-	yes
	1MHz radio interference, voltage ≤ 450μV		1MHz radio interference, voltage ≤ 500μV
Accessory specimen test	Visual inspection of accessory systems containing cables with no signs of deterioration that could affect the normal operation of the system			T	yes	yes	yes	yes	yes
DC voltage test	/		No breakdown between conductor and metal shield in connector, 20kV/1min.	T	-	-	-	yes	-
Performance test of crimped connectors for conductor connecting rods	The total area after crimping is not more than 1.2 times the resistance of an equal length of conductor of the same cross-section.			T	yes	yes	yes	yes	yes

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