DAELIM GREEN EP TECH Manual

No.4 Business Building-2707, China Central Place
Chaoyang District, Beijing-100021, China
Email:[email protected]
北 京 大 林 绿 源 环 保 科 技 有 限 公 司
BEIJING DAELIM GREEN EP TECH CO., LTD.
Operation & Maintenance Manual
SinglePhase & Three Phase Pad-mount Liquid
CompartmentalTransformer
Filled
KVA: Up to 2500 KVA
Primary Voltage: Up to 34.5 KV
BIL: Up to 200 KV

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Chaoyang District, Beijing-100021, China
北 京 大 林 绿 源 环 保 科 技 有 限 公 司
BEIJING DAELIM GREEN EP TECH CO., LTD.
Contents
1. Safety Information......................................................................................................................................................... 4
2. General Information...................................................................................................................................................... 5
2.1 Acceptance and Inspection upon Receipt.......................................................................................................... 5
2.2 Proper Handling and Unloading...........................................................................................................................5
Moving transformers shippedon pallets..................................................................................................... 5
Lifting transformers by crane or hoist.......................................................................................................... 6
Skidding/Rolling Transformers.....................................................................................................................6
Using Jacks tomove transformers.............................................................................................................. 6
3. Storage........................................................................................................................................................................... 6
3.1 Storage for 90 days or less....................................................................................................................................6
3.2 Storage for more than 90 days............................................................................................................................. 7
3.3 Removable Radiators............................................................................................................................................7
4. Installation...................................................................................................................................................................... 7
4.1 Pre-service inspection...........................................................................................................................................7
4.2 Location Consideration......................................................................................................................................... 8
4.3 Mounting the Transformer.....................................................................................................................................8
4.4 External Connection.............................................................................................................................................. 8
Ground Connection........................................................................................................................................9
High Voltage Connection.............................................................................................................................. 9
Low Voltage Connection.............................................................................................................................10
5. Accessories..................................................................................................................................................................10
5.1 Pressure Relief Valve..........................................................................................................................................10
5.2 Fill Plug/Filler Valve with Schrader Valve......................................................................................................... 11
5.3 Drain Valve andFluid Sampler...........................................................................................................................11
5.4 Liquid level gauge................................................................................................................................................ 12
5.5 Temperature gauge............................................................................................................................................. 13
5.6 Pressure Vacuum Gauge................................................................................................................................... 14
5.7 Pressure Relief Device (PRD)............................................................................................................................15
5.8 Rapid Pressure Rise Relay (RPRR) with Seal-in relay................................................................................... 16
5.9 Winding Temperature Indicator......................................................................................................................... 17
5.10 Forced Air Cooling Fans................................................................................................................................. 18
5.11 Current Transformers & Meter Sockets and Watt-Hour Meters................................................................ 19

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6. Switching and Protection Devices.............................................................................................................................20
6.1 Tap Changers.......................................................................................................................................................20
6.2 Load Break Oil-Immersed Rotary Switches (LBOR).......................................................................................21
Two-Position LBOR Switch........................................................................................................................ 21
Four-Position LBOR Switch “Sectionalizing Switch”...............................................................................22
6.3 Dual Voltage Switch.............................................................................................................................................23
6.4 Delta-Wye Switch.................................................................................................................................................24
6.5 Surge Arresters.................................................................................................................................................... 25
Dead front Surge Arresters.........................................................................................................................25
Live front Surge Arresters...........................................................................................................................26
6.6 Fusing.................................................................................................................................................................... 27
Bay-O-Net Fuses......................................................................................................................................... 27
Bay-O-Net fuse replacement instruction (Fig. 17 B)...............................................................................................28
Dry-Well Canister Fuses............................................................................................................................. 28
Non-Loadbreak Dry-Well Canister Fuse replacement instruction (Fig. 18 B)..................................................... 29
Loadbreak Dry-Well Canister Fuse replacement instruction (Fig. 18 B)..............................................................29
7. Dielectric Fluid............................................................................................................................................................. 30
7.1 Type II Mineral Oil................................................................................................................................................ 30
7.2 High Fire PointDielectric fluid............................................................................................................................ 30
8. Factory Testing............................................................................................................................................................31
8.1 Routine Tests........................................................................................................................................................31
Ratio...............................................................................................................................................................31
Winding Resistance.....................................................................................................................................31
No Load andExcitation Current.................................................................................................................31
Load Losses and Impedance Voltage.......................................................................................................31
Dielectric Strength....................................................................................................................................... 32
8.2 S p ecial / D esig n T es t s
...............................................................................................................................................
32
Insulation Power Factor(Tan δ).................................................................................................................32
Insulation Resistance.................................................................................................................................. 32
Temperature Rise........................................................................................................................................ 32
Lightning Impulse.........................................................................................................................................32
Audible Sound Level....................................................................................................................................33
9. Maintenance................................................................................................................................................................ 33
9.1 Spare Parts........................................................................................................................................................... 33

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9.2 Routine Inspection...............................................................................................................................................33
9.3 Dielectric Fluid Sampling.................................................................................................................................... 34

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1. Safety Information:
Theinstructions in this manual are not intended asasubstituteforpropertrainingor adequateexperience
in the safe operation of the equipment described. Only competent technicians who are familiar with
this equipment should install, operate, and service it. These instructions cannot cover all details or variations
in the equipment, procedures, or process described, nor to provide directions for meeting every
possible contingency during installation, operation, or maintenance.
The following conventions are used to indicate and classify precautions and on product safety labeling. Failure
to observe precautions could result in injury to people or damage to property.
HAZARD Statement definition:
T h i s s ym b ol / pi c t o r ial i s u sed to i d e n t i f y a n ELE C T R I C A L S HO CK o r ELE C TR O CUT IO N h a za rd , a ll
installation, maintenance, or repair should be performed by trained, experienced, and qualified
personnel only.
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all
safety messages that follow this symbol to avoid possible injury or death.
Safety Instructions
WARNING: A potential risk exists if operating instructions are not followed which could result in severe
personal injury or death, and equipment damage.
WARNING: The contents of this manual should be carefully read and understood before attempting
any test, repair, installation, removal, or operation of this equipment. Severe personal injury and
equipment damage can occur from the result of improper handling, maintenance, or operation of this
equipment.
WARNING: Transformers should never be opened, serviced, or otherwise tampered with while they
areenergized,ungroundedorconnectedtothesystem.Removingortamperingwithanycovers,
doors, bushings, or seals of an energized transformer may result in death, severe personal injury and
equipment damage.
WARNING: This equipment in not intended to protect human life. Follow all locally approved
procedures and safety practices when installing or operating this equipment. Failure to comply with
these warnings may result in death, severe personal injury and equipment damage.
WARNING: This equipment requires routine inspection and maintenance. Failure to properly inspect
and maintainthis equipment couldresult in unsafe conditionsin and around thisunit,which could
lead to death, severe personal injury and equipment damage.

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2. General Information:
2.1 Acceptance and Inspection upon Receipt:
All Daelim transformers are thoroughly tested and rigorously inspected before shipment from the factory to
ensure the highest quality.
Upon receipt:
1. Thoroughly check all materials against the bill of lading.
2. Locate accessory parts that may have been shipped separately.
3. Carefully check the unit and associated components for any signs of damage caused during shipment.
A damaged crate or pallet can be an indication of rough handling; ifthis condition is found,make a
close inspection of the base and radiators (if equipped) and verify no damage has occurred.
4. In the event that significant damage to the unit orany associated equipment is noticed, rejection of
theshipmentshouldbemadebeforeitisunloaded.Intheeventofminordamages(nicks,scratches,
etc.),carefullyinspecttheunitandnotealldamageonthecarrierscopyofthefreightreceipt.Daelim
Industries ships most units FOB Point of Manufacture, and it is the customer’s responsibility to file a claim
against the carrier.
Note: If acceptance of the transformer is made and damage to the unit is noticed at alater time, it is extremely
difficult to file a claim against the carrier.
2.2 Proper Handling and Unloading
WARNING:HeavyEquipment.Improperhandlingcancausesevereinjury,death,ordamageto
transformer. Before moving the transformer, read the handling instructions provided in this manual.
CAUTION:Thetransformerweightisshownonthetransformernameplate.Mostof the weight isin
the tank that holds the core and coil assembly and the insulating liquid. Do not use hoists, cranes, jacks
or forklifts with load capacity less than the transformer weight.
WARNING: Transformer accessories such as bushings, leads, arrestors, etc… Should never be used as a
handle to move the transformer.
Moving transformers shipped on pallets
Transformers shipped onpalletsmay be lifted ormoved by forklift trucksof proper capacity. When using a
forklift, lift with the transformer tank closest to the mast of the forklift since most of the transformer weight is
in the tank. Pallet mounted equipment may also be moved by crane or hoist.

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Lifting transformers by crane or hoist
Lifting lugs, welded to all transformer tanks, are designed and provided for lifting the complete unit as
shipped.Daelim recommends lifting by these lugs as the primary means of movement. Care should be taken
toensurestraps,chains,andcablesusedtolifttheunitsareinspectedpriortouse. Allstraps,chains,cables,
and lifting devices should be in good working order with sufficient capacity to perform the job intended.
Straps, chains, and cables should NEVER be looped from one lug to another to form a continuous loop around
the unit or even on one side of the unit. Each chain, strap, or cable shouldbe run only to one lifting lug at a
time to prevent loss of control of the unit in the event of a failure with one of the lifting devices.
Cable pull angles should NEVER exceed 30° from vertical or damage to the lifting lugs may occur. Spreader
beams/bars should be used to hold the cables apart and as close to vertical as possible to minimize the forces
on the lifting lugs and lifting devices.
S k iddi ng / Ro lli ng T r an s f o rmer s
Daelimtransformersaredesignedtoberolledorskiddedintoplacewhereaccessibilitytoacraneorother
overhead lifting device is limited or not available. If the unit must be rolled, insure that the area is level, free
from obstructions and debris, and is of sufficient strength and thickness to support the load. When rollers are
used, use as many as necessary to distribute the weight uniformly.
Using Jacks to move transformers
Placejacksunderthetankbaseontheopenendsofthetransformertank.DONOTplacejacksunder
radiators, valves, cabinets or sheet metal components. ALWAYS use at least two jacks per side and raise
evenly to prevent warping of the base.
3. Storage
3.1 Storage for 90 days or less
AllDaelimunits have been thoroughly dried at the factory and shipped with oil at the correct level. Transformers
should always be stored with oil in place to prevent possible contamination and absorption of moisture.
Transformers should be stored in a dry location with no rapid or radical temperature changes. If possible, the
transformer should be storedin its permanent location onthe foundation which hasbeen prepared for it.If
the permanent foundation is not available, it should be stored in its correct upright position on a level
foundation capable of withstanding the weight of the unit without deformation.
CAUTION:
Never store a transformer solely under the jacking steps, on jacks, or on temporary blocking.
Never store the transformer on rollers.
Neverstoretheunitinornearstandingwaterorinareaswithhighmoisture,saltlevels,orcorrosive
gases in the air.

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3.2 Storage for more than 90 days
AllDaelim transformers are shipped with a 2 psi dry nitrogen blanket. During long term storage, it is
recommended that this nitrogen blanket be maintained by the addition of a bottle of dry nitrogen, through a
regulator, to the transformer tank. If the unit is equipped with anti-condensation heaters in the control
cabinets, they should be energized and checked for proper operation. Units with any enclosed air filled spaces,
such as control cabinets and Air Terminal Chambers, should be supplied with an appropriate amount of
moisture absorbing desiccant packets. Desiccant should be monitored and replaced in regular maintenance
intervals as moisture levels in the storage area dictates.
3.3 Removable Radiators
Daelim ships all transformers, when possible, completely assembled and ready for use. In the event that
removableradiatorsareshippedseparatelytoaccommodateshippingorspacerequirements,radiator
openings are shipped with temporary protective caps. Ensure these protective caps are tightly sealed before
storage.
CAUTION: Radiator assemblies should never be stored directly on the ground or in areas in which
water could collect near sealed openings.
4. Installation
4.1 Pre-service inspection
ELECTRICALSHOCK: Never attempt to change connections on an energized transformer. All
installation, maintenance, or repair should be performed by trained, experienced, and qualified
personnel only.
New transformers, or transformers which are being activated after a period of storage, should be thoroughly
inspected before being connected tothe power distribution system to identify damage which mayhave
occurred during storage.
1. The transformer exterior should be inspected for nicks, dents, and scratches. Repair damage to
weather-resistant finishes promptly.
2. The tank cover and manhole/hand hole cover seals and all gaskets or seals at bushings, gauges, fuses,
operating devices, etc., should be inspected for evidence of insulating liquid seepage. Repair leaking or
improperly tightened gaskets and seals before the transformer is placed in service.
3. The liquid level inside the tank must be checked (read directly form gauge on transformers equipped
with liquid level gauge).
4. Basic electrical tests should be conducted before energizing a transformer which was stored for a
period of 90 days or more. Tests include DC insulation Test and Transformer Turns Ratio (TTR). The
resultsofthesetestsshouldbeverifiedwiththeoriginalfactorytestresultsto assurethey arestill
within acceptable limits.

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4.2 Location Consideration
Theunitshouldnotbeplacedwithin36 inchesofanyobstructionsandampleroomshouldbeprovidedforthe
removalofcabinets,covers,andinspectionhatches.Ampleroomshouldbeavailabletoperformperiodic
maintenance inspections and perform repairs as needed. Proper ventilation should be considered to prevent
overheating of the unit. For outdoor installations, proper placement of the unit should be away from walls,
fences, vegetation, or any other structures that would restrict air movement around the unit.
Special precautions should be taken for units installed indoors. Care should be taken to insure adequate
ventilationisprovided. Auto-closingventsshouldbepermanently fixed inthe openpositiontoprevent
unintended closure and accidental overheating of the unit. Fans, blowers or other means of positive air
movement in the space is strongly encouraged to prevent overheating
Indoor Units Recommendation:
1. Thesizeofventsin an enclosedspaceshouldbe atleast20ft2ofinletand20ft2ofoutletareaper
1000 kVA of unit capacity.
2. High Fire Point Insulating Liquid.
3. Cover Mounted Pressure relief device (PRD) also referred to as Explosion Relief device.
CAUTION: Check with local authorities in the intended installation area to verify compliance of any and
all applicable laws.
4.3 Mounting the Transformer
The transformer must be placed on a concrete pad or steel deck of sufficient strength to support the full
weight of the unit. The location must be flat and level and prepared to prevent thetransformer form tilting
beyond two degrees from horizontal
WARNING:Fire Hazard. Non-level installationof transformer canresult infire and causesevere
personalinjuryordeath.Preparetransformerinstallationsitesuchthattransformerdoesnottiltmore
than two (2.0) degrees from horizontal while the transformer is in service at the site.
To maintain full cabinet security, the transformer tank and cabinet base have provisions for installing cleats to
secure transformer to pad. If gaps still exist between the cabinet and pad after cleatingthe cabinet, the
installationwillnotprovidethe securityneededtopreventtamperingbythepublic.Addapermanentmortar
seal to fillthe gaps.
4.4 External Connection
ELECTRICAL SHOCK : Hazardous voltage can cause severe injury, death, or damage to equipment.
Groundtransformerfollowingindustry-acceptedsafegroundingpracticesbeforemakingother
electrical connections. De-energize power distribution wires that will be connected to transformer.
Verify that wires are de-energized at the transformer before connecting to transformer.

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ELECTRICAL SHOCK : Live front parts should such as cables, bushings and other components must be
thoroughly tightened and periodically checked to prevent arcing and overheating.
Clean bushings and terminals before making Connections. Remove dirt, grease or foreign material.
Contamination can cause failure of the bushings. Cables connected to the transformer terminals are to have
sufficientflextoallownormalpadmovementduetogroundfreeze/thawandsettling.Insufficientcableflex
may cause premature failure of the bushings
Ground Connection
Thetransformertankmustbe connectedtoapermanent, low-resistanceground. If the tankisnot solidly
grounded and the transformer is connected to the power distribution system, then the tank should be
regarded as energized. An energized tank is extremely dangerous. Contact with an energized tank can shock,
burn, or causedeath.
Daelim transformers are equipped with at least two ground pads (Fig. 1) or two ground bosses (Fig. 2) depending
on transformers size. One in the primary side and the other in the secondary side.
High Voltage Connection
Diagrams and information supplied on the nameplate must be followed for making connection.
There are two types of typical high voltage connections:
a. Live front transformer connections
Externally/internally clampedporcelain bushingsare normally provided for high voltage connection to
padmount transformers, supplied with eyebolt or Spade terminals that are suitable for copper and aluminum
conductors.
b. Dead front transformer connections
Bushing wells or one piece bushings are normally provided for high voltage connection to padmount
transformers, suitable for elbow connections.
Fig. 1 Fig. 2

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Low Voltage Connection
Spade Terminals ranging from two holes to twenty holes are normally provided for low voltage connection to
padmount transformers.
5. Accessories
5.1 Pressure Relief Valve
AutomaticPressure relief valve (Fig. 3)is standard onallDaelimtransformersand isintendedto slowly
releasepressuretopreventruptureofthetransformertank. Thesevalvesarefactoryadjustedtoventat5±2
PSI Normal operation and atmospheric temperature fluctuations cause the oil and components in the tank to
naturally expand and contract causing the gas filled head spaceinside the tank to fluctuate in pressure.
CAUTION: Before performing any kind of service, which
may include but is not limited to: opening the tank or
inspection cover, removal of fuses, removal of bushings,
openingdrainorfillvalves,oranyothersimilaroperation,
the pressure inside the tank must be safely vented
manually.
CAUTION: Do not open the transformer in the presence
of rain, fog, snow, or if there is condensation on the
exterior components of the unit or when the outside air
temperature is higher than the temperature of the unit.
Evensmallamountsofmoisturethatareallowedtoenter
the transformer tank can decrease the dielectric strength
of the insulating fluid and compromise the integrity of the
unit.
Tomanuallyventthetank,pulltheringsuppliedonthevalve(asshowninthe Fig.3)untilallpressureor
vacuum is relieved.
Fig. 3

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5.2 Fill Plug/Filler Valve with Schrader Valve
Fill Plug with Schrader Valve (Fig. 4 A) or Filler Valve with Schrader Valve (Fig. 4 B) is provided to facilitate
addition of dielectric fluid and Nitrogen to the tank.
5.3 Drain Valve and Fluid Sampler
TheDrain ValveandFluidSampler(Fig.5)isprovidedtofacilitatesamplingofthedielectricfluid fortesting
andotherpurposes.Thevalveisalsoequippedwithaplugrangingfrom½”to2”toprovidemeansofdraining
the dielectric fluid.
Sampling is usually performed on the side of the valve without the need to remove the end plug.
Fig. 4 A
aaaaA4
Fig. 4B
Fig. 5

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5.4 Liquid level gauge
A liquid level gauge (Fig. 6) is supplied to indicatethe amount of dielectric fluid in the transformertank. The
gaugeconsistsofafloatarminsidethetankmagneticallycoupledtotheindicatorneedleinsidethegauge.
Themagneticcouplingmaintainsaliquidtightseparationbetweentheinterioroilandtheoutsidetominimize
potential leaks.
Daelim utilizes several different brands and models of liquid level gauges depending on the application.
Transformers can be supplied with a standard gauge or more sophisticated models with either one or two
SPDT (Single Pole Double Throw) alarm contacts to facilitate external monitoring.
Liquid Levels may vary under normal operation according to temperature and pressure. The 25° C mark is only
a reference fluid level at 25° C
For wiring and other information, please refer to the schematics included in the submittal drawings.
Fig. 6

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5.5 Temperature gauge
The temperature gauge (Fig. 7) is supplied to indicate the dielectric fluid temperature in degrees centigrade at
the top ofthe oil column. The gauge consists of two needles (one white and one red). The white needle is the
current oil temperature of the unit.
The red needle is a resettable maximum indicator. As the temperature of the oil rises, the white needle
pushesthe red needle higher with it. Ifthe temperatureoftheoildeclinesthe white needle followsand goes
downwithtemperature,theredneedlehoweverremainsatthehighesttemperaturereachedandactsas a
recordertoindicatethehighesttemperatureachievedbytheunit. Theredneedle(maximumindicator)can
be reset by turning the knob on the front of the gauge face.
The temperature gauge consists of a long thermocouple that extends into the tank inside a protective
thermocouple well. The isolation between the thermocouple and the dielectric fluid facilities the removal and
replacement of the gauge without draining down the dielectric fluid.
The temperature gauge can be equipped with either one or two SPDT alarm contacts for remote monitoring or
fan control. These alarm contacts are factory set but can be adjusted if desired.
To adjust the contacts,remove the faceofthe gauge. Look toward the center of the gauge fora small Allen
head set screw. Loosen this set screw and manually move the contacts (red indicators toward the outer edge
ofthedial)tothedesiredtemperaturesettings. Gentlyretightenthesetscrewandreplacegaugeface.For
wiring and other information, please refer to the schematics included in the submittal drawings.
Fig. 7

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5.6 Pressure Vacuum Gauge
The pressure vacuum gauge (Fig. 8) indicates whether the head space pressure inside the tank is positive,
negative orneutral. Thepressure inside thetank will vary depending onthe load of theunit, temperature of
the oil and ambient temperature outside. As the oil temperature rises, the pressure inside the tank also rises.
Asthetemperaturefalls,thepressurefalls.Itiscommonforatransformertohaveeitherapositivepressure
or a negativepressure.
Do not be alarmed by a consistent negative pressure (for example, if it’s winter time
In Wisconsin, it will probably be negative for the duration of the season). However, if the gauge consistently
reads zero and does not appear to be changing with environmental or load conditions, this may be an
indication of a leak and may need attention. Visually inspect the unit for any signs of a leak or damaged seal.
The pressure/vacuum gauge can also be equipped with SPDT alarm contacts (by adding a separate pressure
alarm switch) for remote monitoring of positive and negative pressures. When requested, the
pressure/vacuumgaugecanalsobeequippedwithableederorregulator;whenusedinconjunctionwithan
externalnitrogensupply,positivepressurecanbemaintainedinsidethetank(2.5to3.0PSI)Theregulatoris
also equipped with a fitting and valve to take gas samples.
Fig. 8

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5.7 Fault Pressure Relief Device (FPRD)
Also commonly referred to as an Explosion Relief Device (Fig.9), this device facilitates the rapid release of gas
pressure in the event of an internal fault. This device should not be confused with a standard Automatic
Pressure Relief Valve as shown in (Fig. 3), which only releases pressure slowly to account for thermal
expansionandcontraction.APRD iscovermountedandequipped withaspringloadeddiaphragmthatis
factory set to open at a predetermined pressure level (Typically 10 psi). After the tank pressure returns to
normal the Diaphragm will close and reseal the unit. The FPRD is equipped with an indicator (yellow button on
top) that will protrude vertically after an event until it is reset.
The FPRD can also be supplied with SPDT alarm contacts for remote monitoring.
For wiring and other information, please refer to the schematics included in the submittal drawings.
Fig. 9

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5.8 Rapid Pressure Rise Relay (RPRR) with Seal-in relay
ThisRPRR(Fig.10)isadevicefordetectionofsuddenpressureeventsbasedontherateofpressurerisein
The transformer. When a dangerous pressure rise has been detected, the rapid pressure rise relay (RPRR) will
change state. This can be used as an alarm or trip signal to minimize the potential of transformer tank
damage.
For wiring and other information, please refer to the schematics included in the submittal drawings.
Fig. 10

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5.9 Winding Temperature Indicator
Daelim utilizes a digital winding temperature monitor (Fig. 11), this system consists of thermocouples wound
into each coil of the transformer in strategic locations to accurately monitor the temperature inside the coil
itself. The thermocouple leads are brought out of the tank through a sealed bulkhead type fitting within a
protectiveenclosure. ThedigitalreadoutandcontrolsarehousedinaseparateNEMA4enclosuretypically
mounted on side of the tank.
For wiring and other settings information, please refer to the schematics included in the submittal drawings.
Fig. 11

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Chaoyang District, Beijing-100021, China
Email:[email protected]
北 京 大 林 绿 源 环 保 科 技 有 限 公 司
BEIJING DAELIM GREEN EP TECH CO., LTD.
5.10 Forced Air CoolingFans
Forced Air Cooling Fans (Fig. 12) are provided optionally for units supplied with radiators to increase the KVA
capacityofthetransformerbyupto25%withoutoverheatingorexperiencingdetrimentaleffects.Thesize
and number of fans can vary depending on the application. Fans can either be controlled by a top oil
temperature gauge with contacts or by a winding temperature indicator.
For wiring and other
refer to the schematics
submittal drawings.
information, please
included in the
Fig. 12

No.4 Business Building-2707, China Central Place
Chaoyang District, Beijing-100021, China
Email:[email protected]
北 京 大 林 绿 源 环 保 科 技 有 限 公 司
BEIJING DAELIM GREEN EP TECH CO., LTD.
5.11 Current Transformers & Meter Sockets and Watt-Hour Meters.
Padmount transformers may be equipped with CT’s for various reasons such as metering or relaying, they also
may be equipped with meters mounted on the transformer.
Different types and classes of CT’s are used according to the application and the customer needs. (Fig. 13 A) is
a bushing mounted CT, (Fig. 13 B) is an internally mounted CT, and (Fig. 13 C) is a meter socket with Watt-Hour
meter that is used in some of the transformers.
Fig. 13 A Fig. 13B
Fig. 9C