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LIGHTNING PROTECTION PRODUCTS
• No connection without Surge Protection
• Replace from the ground
• 30 Seconds replacement
• Transformer isolation
• Line surge protection
• Hot stick operated
• Zero outage
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LIGHTNING PROTECTION PRODUCTS
CONTENTS
1. Patent pending
2. Introduction: Combi Cut Out
3. Basic Installation
4. Combi Unit Advantages
5. New: Surge Arrester
6. Combi Unit Operation Modes
7. Surge Arrester Insertion Tool
8. Customer Installation
9. Product Data Sheet
10. Introduction: Firewall - Drop Out Surge Arrester System
11. Product Data Sheets
1. Patent pending
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2. Introduction: Combi Cut Out
The Combi Cut Out is a transformer protection isolator that combines both a drop out surge arrester and fuse carrier expulsion link into one.
SURGE ARRESTER
The Surge Arrester is housed in the Combi Unit. It protects both the fuse and transformer from over voltages. In the event of surge arrester failure, the Combi Unit isolates that particular phase of the transformer, thereby eliminating further over voltage to that phase transformer. This provides a fail safe system to protect the transformer
FUSE CARRIER
The Fuse Carrier operates to isolate the overloaded or faulty transformer. The subsequent phase is isolated when the current drawn through the fuse element exceeds the rating thereof.
FUNCTION
The Combi Unit is designed to protect distribution transformers from lightning and over voltage, and to isolate faulty transformers. The Combi Unit offers effective protection to transformers ranging in size from 16kva to 1mva. On medium voltage networks ranging from: 3.3kv, 6.6kv, 12kv, 24kv up to 36kv.
RATINGS
Ÿ Operating voltages - 12kv, 24kv and 36kvŸ Continuous current ratings 100AŸ Load break current on base 7AŸ 4ka breaking capacity for 12kv, 24kv and 36kv
(greater fault levels available on request)Ÿ Creeping (coastal applications)
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3. Basic Installation
COMBI CUT OUT(Transformer Protection)Surge Arrester - Fuse
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4. Combi Unit Advantages
Convenient to maintainŸ Replace a surge arrester in 3 minutes Ÿ The Combi Unit provides enhanced safety during surge arrester maintenance
No customer outage during maintenanceŸ Traditionally, surge arrester maintenance required scheduled outage, and may have taken weeks to arrangeŸ The Combi Unit allows immediate on-the-spot surge arrester replacement
100% ensured transformer surge protectionWhen the surge arrester blows, it isolates the phase and ensures that no further surges damage the transformer until a replacement is installed. The user cannot turn the power on until a new surge arrester is installed. This is known as Unique Surge Arrester Alert.
The conventional surge arrester replacement can take an electrical utility between 1 - 4 hours.Recover time lost during the standard surge arrester replacement procedure:Ÿ Phone customer to arrange a planned outage (24 - 48 hours before maintenance)Ÿ Drive to site (5 - 30 minutes)Ÿ Install portable earth kits (5 minutes)Ÿ Get ladder and unload vehicle (5 - 10 minutes)Ÿ Put on FAS kit (5 - 10 minutes)Ÿ Get toolbox and put on gloves (5 - 10 minutes)Ÿ Remove old surge arrester (20 - 30 minutes)Ÿ Remove portable earth kits (5 minutes)Ÿ Remove FAS kit (5 minutes)Ÿ Finalise safety checks, and drive back to substation (20 minutes)Ÿ Phone control and inform them that power is to be switched on (5 minutes)Ÿ Close the links and restore power
Replace surge arresters with a hot stickIt is much safer and more cost effective to replace a surge arrester from the ground level.
Nuisance fusing eliminatedThe Combi Unit must be installed within 1m of the transformer and ensures that the fuse and surge arrester are connected in parallel. The fuse must not be placed into the surge arrester holder or vice versa, as they vary in length.
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5. New: Surge Arrester
ADVANTAGES
Ÿ Eliminates transformer failureŸ Low long term savingsŸ Hot stick / link stick replacementŸ Eliminate nuisance fuse blowsŸ Replace surge arrester live lineŸ Replace surge arrester from the groundŸ Ensured safety, convenience and speedŸ Better customer serviceŸ Visual & electrical indication of spent surge arresterŸ No outage required (no switching off the line)Ÿ Working with a 100kV hot stick / link stick is safer
from the ground than a ladder from heights
DISADVANTAGES
Ÿ Outage required (3 - 4 hours)Ÿ Very high costŸ Multiple fuse blows recorded at transformersŸ 2 - 3 Arrester replacement time
(arrester replaced by hand)Ÿ Outage needs to be managed Ÿ Poor customer service, many customers affectedŸ Many hours outage logged from time of callŸ Loss of revenue for utility
Long outage duration (kwh hours lost)Ÿ Unsafe Ÿ No physical nor electrical indicationŸ Risk of slipping and falling when climbing poles
(often in wet weather)
NEW SURGE ARRESTER OLD SURGE ARRESTER SYSTEM
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6. Combi Unit Operation Modes
TRANSFORMER
AB
CEXPLANATION
1) Position AThe normal position of the fuse carrier during transformer operation
2) Position BThe fuse carrier position after fuse failure
3) Position CThe insertion tool cylinder is used to bring the fuse carrier to ground during fuse failureThe expired fuse element inside the fuse carrier is replaced with a new unit
4) Position AThe fuse carrier with a new fuse element is closed into position (A)
6.1) FUSE OPERATION MODE
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6. Combi Unit Operation Modes
EXPLANATION
1) Position AThe position of the surge arrester during normal operation
2) Position BThe position of the surge arrester after once expired
3) Position CThe subsequent position of the fuse carrier after the surge arrester has expired
4) Position BThe insertion tool cylinder is used to bring the surge arrester to ground during failure.The new surge arrester is loaded into the insertion tool cylinder The new surge arrester can now be closed into position (A)
5) Position DThe fuse carrier, still in position (C), can now be closed into position (D)
6.2) SURGE ARRESTER OPERATION MODE
A
B C
D
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TRANSFORMER
6. Combi Unit Operation Modes
EXPLANATION
1) Position AThe normal position of the fuse carrier during transformer operation
2) Position BThe fuse position after a fuse failure
3) Position CThe insertion tool cylinder is used to bring the fuse carrier to ground during a fuse failureThe expired fuse element inside the fuse carrier is replaced with a new unit
4) Position AThe fuse carrier with a new fuse element inside is closed into position (A)
6.3) MANUAL OPERATION MODE - Fuse carrier removal
A1
A2
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6. Combi Unit Operation Modes
EXPLANATION
1) Position A1The Combi Unit release lever is pushed upward via the insertion tool cylinder
2) Position A2The fuse carrier falls into the open position
3) Position B1The Combi Unit release lever is pulled downward via the insertion tool cylinder
4) Position B2The surge arrester falls into the open position
6.4) MANUAL OPERATION MODE - Surge arrester removal
A1
A2
B1
B2
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TRANSFORMER
7.1 Surge Arrester Insertion Tool
HOW DOES IT WORK?The Insertion Tool has been tested to ensure safety & effortless replacement of surge arresters Combi Unit and drop out surge arrester. This ensures safety of the utility staff.
Ÿ It is made from aluminium to provide a rust-proof, light but durable unitŸ Specially designed to carry heavier units, such as the 11kv, 22kv, and 33kv surge arrestersŸ Also suitable for standard fuse tubes already in the fieldŸ Fits at the end of any link stick by means of the standard rose connection at the bottom of the unit
FEATURES:Insertion SlotIt has a special slot which carries both the Eskom fuse link and Surge Arresters. This helps for centre of gravity when it comes to inserting heavier units such as the Surge Arresters.It fits at the end of the flower of any link stick.
Removal HookThe hook provides any easy way of clipping the surge arrester and fuse carrier unit.Once it is clipped out, it can be slot into place and brought to ground level.
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7.2 Surge Arrester Replacement Via Hot Stick / Link Stick
The insertion tool has a universal flower that fits onto any conventional telescopic link stick.
The operation from entry to insertion and closing takes only 30 seconds for fuse and surge arrester.
A fuse carrier is approximately 1kg An 1kV surge arrester is approximately 3kg A 22kV surge arrester is approximately 4kg A 33kV surge arrester is approximately 6kg
This can be applied to all surge arrester brands and all voltages, from 11kV, 22kV to 33kV.
(A) Surge arrester earpiece (insertion)
(B) Trunion ring (removal)
Insertion slot
Removal hook
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7.3 Insertion: Fuse Carrier
Ÿ The insertion tool has a universal flower that fits onto any conventional telescopic link stickŸ The surge arrester has an earpiece, position (A)Ÿ The earpiece fits into the insertion slot during insertion at position (B)Ÿ A removal hook can be used to remove an expired surge arrester, at position (C)Ÿ It can also be used to remove the surge arrester at position (D), trunion ring.Ÿ It is then extended via a telescopic link stick into and positioned.Ÿ The operation from entry to insertion and closing takes no longer than 30 seconds.Ÿ A fuse carrier is approximately 1kg
A surge arrester inserted upside down has a better centre of gravity and no chance of slipping and falling.
(A) Fuse carrier earpiece (insertion)
(D) Trunion ring (removal)
(B) Insertion slot
(C) Removal hook
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8. Customer Installation
BEFORE
Customer: LEC - Thuate Mountain Econet Tower 11kV 150kva1) 2x Transformer lost per annum2) Frequent fuse failures3) Frequent outage times4) Surge arresters not replaced in time5) No indication when surge arrester is spent
AFTER
Customer: LEC - Thuate Mountain Econet Tower 11kV 150kva1) No transformer losses2) Fuse failures eliminated3) Outage times eliminated4) Surge arresters replaced in time5) Electrical & physical indication of spent surge arresters
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9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
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9. Product Data Sheet
10 Introduction: Firewall - Drop Out Surge Arrester System
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Firewall Bracket (universal)The Firewall is used for line surge protection and is available in voltages up to 36kv. The Firewall bracket is universal and can house various brands of surge arrest manufacturers (Maclean, Cooper, ABB, Siemens, and Areva / Tridelta).
Surge ArresterThe surge arrester housed in the Firewall unit protects the overhead line from over voltages. In the event of a surge arrester failure, the surge arrester drops out, signalling replacement.
The Firewall Bracket unit becomes part of that line infrastructure for a 20 - 30 year period. During its lifespan it will house many surge arresters, thereby eliminating further outages and facilitate surge arrester maintenance.
It is advisable to install Firewall Brackets in areas with higher lightning activity, where surge arrester replacement is more frequent, and in industries where shutdown is an issue, as well as in cities and high customer density.
FunctionThe Firewall is designed to protect overhead lines from voltage and enables the utility to populate the line without concern for outages (maintenance) at a later stage for replacement. Firewalls have also been used at the transformer for easier surge arrester replacement, instead of conventional surge arrester systems.
RatingsŸ Operating voltages range from 12kv, 24kv, and 36kvŸ Universal bracket housing various brands of surge arresters
PRODUCT FEATURES36kv Drop out surge arrester29kv MCOVLink stick replaceable
10.1 Firewall - Drop Out Surge Arresters
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The most common voltages are from 3.3kv, 6.6kv, 12kv and 24kv which fit into the drop out surge arrester Firewall bracket.
The drop out surge arrester is the safest surge arrester system, with a no recorded injuries to replace the surge arrester with a telescopic link stick.
1) Safest surge arrester in the worldTechnician cannot get injured by replacing the surge arrester from the ground.
2) Visual indicationThe drop out surge arrester will drop out only when the surge arrester expires. Not every time there is a lightning storm.
3) Reduce fault findingShould a surge arrester malfunction and SEF (Sensitive Earth Fault), the surge arrester can easily be pulled out via a hot stick or telescopic link.
4) Improve customer serviceReduce surge arrester replacement time from minutes and hours to seconds.
5) Improve probability of replacementEskom studies indicate that drop out surge arresters are 4 times more likely to be replaced than fixed types.
BENEFITS
10.2 Firewall - Drop Out Surge Arresters - Advantages
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1) Changed live line2) Changed from ground3) Easily identified when blown4) Safer5) Easier maintenance6) Easy & effective replacement7) Elimination of outage times8) Cost effective method of protecting an area9) Arrester can effectively be opened if Problematic Arresters or GLDs are present10) Easy isolation during fault finding11) Operational staff relieved of dangerous situations12) Operational staff response to arrester maintenance improved13) On the spot replacement14) Building up staff attitudes by providing easier maintenance of arrester unit15) Fear factor operational staff removed when working on high voltage equipment16) Line inspections a pleasure17) Spent arrester easily identified for replacement from previous lightning incident18) Risk of equipment exposure eliminated19) Faulty units immediately replaced, no postponing of the maintenance effort20) Used at distribution line ends and T-offs (voltage doubling points)
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1) Install Arresters at strategic poles on poorly insulated lines
2) Install Arresters as Firewalls to assist Surge Arresters placed at the transformer. Commonly placed one pole away from a critical transformer placement in order to assist surge arresters at the transformer Combi Unit.
3) Install Arresters at poles that are consistently struck by lightning causing split poles and line damage.
4) Install Arresters at the end of the overhead line, where voltage doubling occurs and where underground cable must be protected against voltage refraction and damage.
5) Install Arresters at points on overhead lines that are supposedly protected by high masts but where equipment loss remains high. 6) Install Arresters to prevent poor performing lines from causing ARCs and “tripping” on the overhead lines.
7) Install Arresters rather than conventional arresters to avoid outages and to improve customer service.
10.3 Firewall - Drop Out Surge Arresters - Installation Guide
10.4 Firewall - Drop Out Surge Arresters - Operation Mode
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EXPLANATION
1) Position AThe position of the surge arrester during normal operation. Surge arresters drain lightning to earth.
2) Position BThe position of the surge arrester when a surge arrester has expired.
3) Position AThe subsequent position of surge arrester once the surge arrester has been inserted back into position.
B
A
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11 Firewall - Drop Out Surge Arresters - Product Data Sheet
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11 Firewall - Drop Out Surge Arresters - Product Data Sheet
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11 Firewall - Drop Out Surge Arresters - Product Data Sheet
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11 Firewall - Drop Out Surge Arresters - Product Data Sheet
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11 Firewall - Drop Out Surge Arresters - Product Data Sheet
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11 Firewall - Drop Out Surge Arresters - Product Data Sheet
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11 Firewall - Drop Out Surge Arresters - Product Data Sheet
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11 Firewall - Drop Out Surge Arresters - Product Data Sheet
LIGHTNING PROTECTION PRODUCTS
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