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MV Surge Arresters upto 36 kV

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MV Surge Arrester upto 45kV for substation protection from lightening and switching over voltages. In past 15 years, almost all high-voltage networks used MO arresters. However, in medium-voltage networks, a substantial number of conventional gapped arresters (SiC resistors and series spark gaps) were installed until a few years ago. Today MO (Metal-Oxide) arresters without spark gaps have gained popularity. Networks require improved protection level and better performance in polluted environments. The switch to polymeric housings made it possible to do without the previously necessary spark gaps. Polymeric housings are reliable against ingress of moisture and provide minimal risk of failures (violent shattering of the housing). MVSA are manufactured using high quality MOV blocks which display excellent thermal and current handling characteristics due to guaranteed homogeneity of the varistor volume.  In the wrap design surge arresters, the MOV blocks are wrapped with fiberglass ribbons impregnated with epoxy resin to create stacks of MOV blocks.

Excellent TOV performance.
Safe, non-shattering failure in short circuit test
Higher energy handling capability
Crimped structural construction is light in weight, provides optimal mechanical strength
Void free construction and optimum interface sealing achieved by bonding silicone housing directly to MOV blocks and aluminium end fittings with special bonding solution
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Specifications

Distribution Medium Duty (DM) Class MV Surge Arrester (Outdoor)
Bowthorpe EMP DA0 series surge arrester
Tested in accordance with IEC60099-4 at independent accredited laboratories
Direct moulded housing prevents moisture ingress
Low residual voltages
High-energy handling safe non-shattering short circuit behavior at higher current levels
Maintenance free Hydrophobic silicone housing, tracking and erosion resistant
Excellent cantilever and tensile performance
Quality design conforming to international standards
Application - protection of MV networks and equipment from lightning and switching surge related over-voltages, optimized to protect distribution assets including transformers and cable-end terminations

Distribution Heavy Duty (DH) Class MV Surge Arrester (Outdoor)
Safe non-shattering short circuit behaviour to higher current levels
Cage design
Type tested in accordance with IEC60099-4, Ed 3.0 (2014) at independent laboratories
Alternating sheds for best pollution flashover resistance
Hydrophobic silicone housing for outdoor use
Excellent operating performance and long service life
Directly molded housing prevents moisture ingress

Technical Information

Distribution Medium Duty (DM) Class MV Surge Arrester (Outdoor)		DA0
Application		Outdoor
Rated voltage Ur	kV	3-12
Line discharge class as per IEC60099-4		1
Arrester class designation		DM
Rated discharge current 8/20 µs	kA	5
High current impulse 4/10µs	kA	100
TOV (kV)
1s		1.18xUr
100s		1.12xUr
High current short circuit Pre failing method	kA	16
Mechanical data
Cantilever	Nm	150
Tension	N	1000
Torque	Nm	30

Distribution Heavy Duty (DH) Class MV Surge Arrester –(Outdoor)		DA1	HDA	HDA-M	OCP-1
Application		Outdoor	Outdoor	Outdoor	Outdoor
Rated voltage Ur	kV	4-45	3.7-30	32.5-51.2	4-51.5
Line discharge class as per IEC60099-4		1	1	1	1
Arrester class designation		DH	DH	DH	DH
Rated discharge current 8/20 µs	kA	10	10	10	10
High current impulse 4/10µs	kA	100	100	100	100
Energy (according to IEC 99-4, 8.5) Line discharge	kJ / kV Ur	5.6	5.3	5.3	5.1
High current short circuit Pre failing method	kA	21	40	40	25
Mechanical data
Cantilever	Nm	350	350	350	350
Tension	N	2000	2000	2000	2000
Torque	Nm	50	50	50	50

Distribution Heavy Duty (DH) Class MV Surge Arrester (Outdoor)		DOV
Application		Outdoor
Rated voltage Ur	kV	3- 36
Arrester class designation		DH
Rated discharge current 8/20 µs	kA	10
High current impulse 4/10µs	kA	100
Repetitive Charge transfer rating (Qrs)	C	0.4
Thermal Charge transfer rating (Qth)	C	1.1
TOV (kV)
1s		1.12xUr
10s		1.08xUr

Distribution Heavy Duty (DH) Class MV Surge Arrester (Indoor)		RDA	SPA	CPA
Application		Indoor	Indoor	Indoor
Rated voltage Ur	kV	7.5-30	7.5-40	4-51.5
Arrester class designation		DH	DH	DH
Rated discharge current 8/20 µs	kA	10	10	10
High current impulse 4/10µs	kA	100	100	100
Energy (according to IEC 99-4, 8.5) Line discharge	kJ / kV Ur	3.3	3.3	3.3
10s		1.25	1.25	1.25
High current short circuit Pre failing method	kA	16	16	16
Mechanical data
Cantilever	Nm	200	200	200
Tension	N	1000	1000	1000
Torque	Nm	58	58	58

Station Low Duty (SL) Class MV Surge Arrester (Indoor)		PCA-I
Application		Indoor
Rated voltage Ur	kV	6- 72.5
Arrester class designation		SL
Rated discharge current 8/20 µs	kA	10
High current impulse 4/10µs	kA	100
Energy (according to IEC 99-4, 8.5) Line discharge	kJ / kV Ur	7.8
Repetitive Charge transfer rating Qrs)	C	2.2
TOV (kV)
1s		1.15x Ur
10s		1.10x Ur
High current short circuit Pre failing method	kA	63
Mechanical strength
Safe Long -term load (SLL)	kNm	2
Safe Long -term load (SSL)	kNm	2.5

Station Low Duty (SL) Class MV Surge Arrester (Outdoor)		OCP-2	PAA1	PCA-I
Application		Outdoor	Outdoor	Outdoor
Rated voltage Ur	kV	6- 72.5	6- 72.5	6-42
Arrester class designation		SL	SL	SL
Rated discharge current 8/20 µs	kA	10	10	10
High current impulse 4/10µs	kA	100	100	100
Energy (according to IEC 99-4, 8.5) Line discharge	kJ / kV Ur	7.5	4.5	7.8
TOV (kV)
1s		1.14 x Ur	1.08x Ur	1.15x Ur
10s		1.12x Ur	1.04x Ur	1.10x Ur
High current short circuit (Pre failing method)	kA	25	40	65