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DET-882

SecoGear Medium-voltage Switchgear Application and Technical Guide

System and Equipment Protection

©2017 General Electric All Rights Reserved

33

Table 4-1: Remote Control Schemes

Control Location

Local

Remote

Devices Required
(in addition to remote control switch)

Breaker Operation

Close

Trip

Close

Trip

Breaker Position Conn Test Conn Test Conn Test Conn Test

Remote

Control

Scheme

A

X

X

X

X

X

X

Local permissive switch (69CS), plus breaker
position switch (52POS)

B

X

X

X

X

Local permissive switch (52CS), plus breaker
position switch (52POS)

C*

X

X

X

X

X

Local permissive switch (52CS), plus breaker
position switch (52POS)

Basic Control

X

X

X

X

Control switch (52CS)

Key:
X = This manually initiated operation is possible.
* = This scheme uses same devices as scheme B, but different wiring.

Instrumentation, Current, and Voltage Transformers

Basic current or voltage indication in SecoGear switchgear
can be via a switchboard type analog meter and transfer
switch, a digital meter, or can be a feature of a
multifunction protective relay. Most solid-state
multifunction relays today offer some type of metering
capabilities, including voltage, current, watts, vars,
frequency, and the demand functions.

AM and VM Scales

Ammeter scales are determined by the CT ratio. Current
transformer ratings are normally selected based on
approximately 125 % of the ampacity of the feeder circuit
conductors. Current transformer ratios selected in this
manner permit settings of circuit overcurrent-protective
relays to provide good selectivity and protection. For a
properly designed circuit, operating at full load, this means
a maximum scale reading of between half and three-
quarter scale.

For a circuit that provides for substantial future expansion,
lower scale readings will indicate initial-load conditions.
The voltmeter scale, determined by the voltage
transformer ratio, is 125 percent of the nominal line-to-line
VT rating. Optional wattmeters and varmeters, switchboard
type, are available for most equipment. Wattmeter and
varmeter scales are determined by the CT and VT ratios.

CT and VT Ratios

Standard window-type current transformers are available
in ratios ranging from 50:5 to 4000:5 amperes. The basic
ground-sensor window-type CT (GSCT) ratio is 50:5
amperes, with a 7.25 in window. Relay accuracy class is
per IEEE C37.20.2-2015, Table 4. Higher accuracy classes
may be available; however, space for mounting such CTs is
limited.

Table 4-2: Single Ratio CTs

CT Ratio

Standard

Accuracy Class

High Accuracy

Class

1

50:5 A

C10

100:5 A

C10

C20

150:5 A

C20

C50

200:5 A

C20

C50

250:5 A

C20

C50

300:5 A

C20

C100

400:5 A

C50

C100

500:5 A

C50

C100

600:5 A

C100

C200

800:5 A

C100

C200

1000:5 A

C100

C200

1200:5 A

C200

C400

1500:5 A

C200

C400

2000:5 A

C200

C400

2500:5 A

C200

C400

3000:5 A

C200

C400

4000:5 A

C200

C400

5000:5 A

C200

C400

Note:
1.

High accuracy requires twice the mounting space of a standard
accuracy CT.

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Содержание SecoGear

Страница 1: ...DET 882 Application and Technical Guide SecoGear ZE ZE 8444 MecP R PS Switchgear GE Energy Connections Industrial Solutions ...

Страница 2: ...rty of their respective owners WARRANTY This document is based on information available at the time of its publication While efforts have been made to ensure accuracy the information contained herein does not cover all details or variations in hardware and software nor does it provide for every possible contingency in connection with installation operation and maintenance Features may be described...

Страница 3: ...losing and Latching Current 11 Continuous Current 11 Rated Interrupting Time 11 Duty Cycle 11 Special Switching Applications 11 Automatic Transfer 11 Capacitor Switching 12 Service Conditions 12 Usual Service Conditions 12 Unusual Service Conditions 12 Abnormal Temperature 12 Temperature Rise 12 High Altitude 12 Breaker Accessories 13 Breaker Lift Truck 13 Related Circuit Breaker References 14 Typ...

Страница 4: ...tection 31 Motors 31 Transmission Line 31 Generators 31 Open Phase Protection 31 Automatic Reclosing 31 Directional Power Underfrequency and Undervoltage Protection 32 Arc Flash Detection 32 Basic Equipment Protection 32 Circuit Breaker Control and Control Power Protection 32 Instrumentation Current and Voltage Transformers 33 AM and VM Scales 33 CT and VT Ratios 33 Metering and Test Block 34 Cont...

Страница 5: ... IMFE IMF1 IMF2 47 Protection 47 Indication 47 Control 47 Location of Optional Devices 47 Reduced Voltage Starting 49 Synchronous Motor Feeders SMF 49 Protective Scheme Selection 49 Optional Equipment Selection for SMF1 and SMF2 50 Protection 50 Excitation 50 Indication 50 Control 50 Location of Optional Devices 50 Standard Breaker and Auxiliary Configurations 52 Standard Tie Breaker and Auxiliary...

Страница 6: ...tment B 6 Figure 1 14 Breaker in Compartment A Line connected CPT and VT Rollouts in Compartment B 6 Figure 1 15 Breaker in Compartment A Line and Bus connected VT Rollouts in Compartment B 7 Figure 1 16 Breaker in Compartment B Bus connected VT Rollout in Compartment A 7 Figure 1 17 Breaker in Compartment B Bus connected CPT in Compartment A 7 Figure 1 18 Bus Entry in Compartment A Cabling Above ...

Страница 7: ...igure 6 9 Disconnect Plug Not Mechanically Interlocked 58 Figure 6 10 Disconnect Plug Mechanically Interlocked 58 Figure 6 11 Rear Door Padlocking Provision 58 Figure 6 12 Front Door Padlocking Provision 58 Figure 6 13 Breaker Racking Padlock 58 Figure 6 14 Shutter Padlocking Provision 59 Figure 6 15 Open Close Pushbutton Locked 59 Figure 6 16 Open Close Pushbutton Open 59 Figure 6 17 CT Mounting ...

Страница 8: ...trol Voltages and Currents 18 Table 3 2 Contact Ratings for MOC TOC and Breaker Auxiliary Switches 18 Table 3 3 Simultaneous Breaker Tripping 20 Table 3 4 GE Type HEA Lockout Relay Coil Current Characteristics 20 Table 3 5 AC Load Factor for Charger Battery Voltage 20 Table 3 6 Battery Selection Guide 21 Table 3 7 Battery Sizing Example A 22 Table 3 8 Battery Sizing Example B 22 Table 3 9 AC Load ...

Страница 9: ...ng the use of SecoGear switchgear and SecoVac breakers in basic circuit applications Also included are auxiliary unit and power conductor compartment structuring After selecting individual units an optimum lineup configuration can be developed using the guidelines given A specification procedure complete with Guide Form Specifications is recommended to facilitate the documentation of SecoGear Meta...

Страница 10: ...e stacking cabling direction and VT CPT compartment considerations are key when translating the one line diagram into a valid arrangement of switchgear cubicles auxiliary rollouts and bus connections in a lineup These application considerations are necessary as a result of the equipment design A brief illustration of SecoGear switchgear design concepts is provided to assist in understanding Figure...

Страница 11: ...m 3300 ft 1000 m a s l High Altitude At altitudes above 1000 m consult IEEEC27 20 2 for derating factors applicable to dielectric and current values Applicable Industry Standards Table 1 2 Applicable American National Standards Institute ANSI Standards Standard No Description C37 04 Rating Structure for AC High Voltage Circuit Breaker IEEE Standard C37 06 AC High Voltage Circuit Breakers Rated on ...

Страница 12: ...ure 1 5 Dual VT Rollouts Line Bus Connected Upper or Lower Section Figure 1 6 Dual CPT Rollouts Line Bus Connected Upper or Lower Section Figure 1 7 1200 A 2000 A Upper or Lower Breaker Section Figure 1 8 VT Rollout Line Bus Connected and Fuse Rollout Line Connected Lower Section VT VT CPT CPT Space for 4 CTs per phase 2 on upper studs 2 on lower studs Breaker VT Fuse Rollout ...

Страница 13: ...tment A or B can be located in the upper or lower position as shown in Figure 1 10 3 A fused rollout in compartment A is available as bus connected only 4 The upper rollout in compartment A can be bus connected as long as the lower rollout in compartment A is bus connected The lower rollout in compartment A can be bus connected regardless of the connection to the upper rollout in compartment A The...

Страница 14: ... 26 illustrate how upper and lower units can be combined with the associated power connections Figure 1 11 Breaker in Compartment A Bus connected VTs in Compartment B Figure 1 12 Breaker in Compartment A Line connected VTs in Compartment B Figure 1 13 Breaker in Compartment A Bus connected VTs and CPT Fuse Rollout in Compartment B Cabling to the breaker must enter or exit above Figure 1 14 Breaker...

Страница 15: ...er in Compartment A Line and Bus connected VT Rollouts in Compartment B Figure 1 16 Breaker in Compartment B Bus connected VT Rollout in Compartment A Figure 1 17 Breaker in Compartment B Bus connected CPT in Compartment A Figure 1 18 Bus Entry in Compartment A Cabling Above Breaker in Compartment B Cabling Below Breaker VT A B CTs VT Breaker A B CTs VT Breaker A B CTs CPT Breaker A B CTs ...

Страница 16: ... 19 Breaker in Compartment B Bus connected VTs and CPT in Compartment A Figure 1 20 Breaker in Compartment B Line connected VT Rollouts in Compartment A Figure 1 21 Typical Two high Breaker Section Cabling Below Figure 1 22 Typical Two high Breaker Section Cabling Above Breaker A B CTs CPT VT Breaker A B CTs VT VT Breaker A B CTs Breaker GSCT GSCT Breaker A B CTs Breaker GSCT GSCT ...

Страница 17: ...Compartment A Cabling Above Bus Entry in Compartment B Cabling Below Figure 1 24 Breaker in Compartment A Bus connected VTs and Line connected Fuse Rollout in Compartment B Figure 1 25 Bus connected VTs in Compartment A Bus Tie Breaker in Compartment B Figure 1 26 Bus connected VTs in Compartment A Aux Tie in Compartment B Breaker A B CTs Breaker Fuse Rollout A B CTs VT Breaker A B CTs VT A B VT ...

Страница 18: ...ker selection is based on the duty requirements For your application find the model SecoVac VB2 circuit breaker rated for those specifications Table 2 1 It is important to consult the ANSI Standard C37 010 for proper guidance on duty requirements see Related Circuit Breaker References item 2 When selecting a circuit breaker you must consider several characteristics such as circuit voltage system f...

Страница 19: ...for 50 Hz Continuous Current To select the proper SecoVac VB2 breaker calculate the continuous current duty based on the loads of the feeders and main breaker and identify a continuous current rating equal to or greater than the load current SecoVac circuit breakers are 100 rated with no continuous overload rating For special applications with long time overload rating such as motors generators or...

Страница 20: ...ected to each relay as an Auto Off transfer scheme selector Because a relay is required for each the three circuit breakers it allows bus splitting This operation is accomplished by setting the time overcurrent elements in the relay on the bus tie breaker to trip faster than the incomers opening the bus tie before an incomer when operating from only one source Capacitor Switching Capacitor banks a...

Страница 21: ...reduced which can offset the higher altitude continuous current derating effect NOTICE The recommendations are subject to modification depending on the actual system conditions Correction factors are different for switchgear and for power transformers Any application to use metal clad switchgear above 1000 meters 3300 ft should be referred to GE for evaluation Table 2 3 Altitude Correction Factors...

Страница 22: ... fuse rollouts Using the lift truck for any other application may result in damage to the carriage or injury to personnel The lift truck requires a winch handle to raise or lower the carriage and it will hold its position thanks to a clutch break within the winch RELATED CIRCUIT BREAKER REFERENCES 1 IEEE Standard C37 06 Schedules of Preferred Ratings and Related Required Capabilities for AC High V...

Страница 23: ...Reserved 15 Figure 2 3 SecoVac VB2 Breaker Front Panel Figure 2 4 Spring Discharge Instructions Open pushbutton Spring discharge instructions Breaker nameplate Spring charge status indicator HV warning label Open close indicator Close pushbutton Secondary disconnect plug connector Vacuum bottle label Operation counter Charging handle ...

Страница 24: ...connect Anti pumping relay Auxiliary switch Close Block Contact Energy storing travel switch S1 S3 S5 52AUX M Spring Charge Motor K0 TC CC Closing coil Trip coil BC MM UM Close Block Solenoid UVR coil optional Rectifier V1 V6 ZC BKR Lock Solenoid Optional Limit switch for trip free TC2 2nd Trip coil optional xx xx xx Switchgear Terminal block Number Breaker Secondary Pin Number Auxiliary Contact N...

Страница 25: ...oGear Medium voltage Switchgear Application and Technical Guide Circuit Breaker Selection 2017 General Electric All Rights Reserved 17 Figure 2 8 Example Main Breaker Control Circuit 850 Relay Expanded MOC Switch ...

Страница 26: ...s Table 3 1 SecoVac VB2 IEEE Circuit Breaker Control Voltages and Currents Breaker Control Source Voltage Closing Voltage Range Tripping Voltage Range Closing Coil Current Tripping Coil Current Charge Motor Inrush Current Charge Motor Run Current 1 48 Vdc 38 Vdc 56 Vdc 28 Vdc 56 Vdc 15 84 A 15 84 A 20 A 3 2 A 125 Vdc 100 Vdc 140 Vdc 70 Vdc 140 Vdc 2 78 A 2 78 A 8 8 A 1 2 A 250 Vdc 200 Vdc 280 Vdc ...

Страница 27: ...6 with batteries fully charged will maintain a charge for a minimum of three days after the AC power has been interrupted In normal operation the batteries are trickle charged from the AC voltage source The Autocharge Capacitor trip device is provided on SecoVac breakers whenever AC control voltage is specified GE offers for both 120 Vac and 240 Vac control power sources Direct Acting Undervoltage...

Страница 28: ...taneous Breaker Tripping Number of Breakers in Lineup Probable Max Number of Breakers Tripped Simultaneously per Cause Time Delay Fault Protection Instantaneous Fault Protection Undervoltage or Bus Differential 2 1 1 1 1 2 1 1 1 3 5 2 3 All 6 10 3 4 All 10 1 1 All Notes 1 Depends upon operating conditions 2 Use of single undervoltage or bus differential relay for tripping all breakers If lockout r...

Страница 29: ...pes Pasted plate with lead antimony grids Lead calcium a pasted plate construction with calcium replacing antimony as the additive for grid strength Pasted plate lead antimony is the basic lead acid battery familiar in another form as the automobile battery For control work compared to auto batteries thicker plates and lower gravity of acid provide longer life and allow long time trickle or float ...

Страница 30: ...larger so trip current will be used in the next step shown in Table 3 8 Table 3 8 Battery Sizing Example B Current Lead acid Nickel cadmium 48 Vdc 125 Vdc 48 Vdc 125 Vdc Max 1 min demand 31 68 A 5 56 A 31 68 A 5 56 A 8 hr equiv max 1 min demand conversion factor1 21 12 AH 3 71 AH 10 92 AH 1 92 AH Lamp load 0 105 A x 8 hrs 0 84 AH 0 84 AH 0 84 AH 0 84 AH Total AH amp hrs at 8 hr rate 21 96 AH 4 55 ...

Страница 31: ...ected AC CONTROL POWER EQUIPMENT Control power equipment for SecoGear Switchgear operated through an AC source should be powered from a separate transformer that will not be likely to be de energized in order to minimize the possibility of unexpected interruption of the control system Application When energizing a switchgear from multiple sources it s necessary to operate breakers with a control p...

Страница 32: ...ork Per Vertical Section Heat Loss 1 1200 A breaker 485 W 1 2000 A breaker 880 W 2 1200 A breakers stacked 944 W 1 1200 A 1 2000 A breaker stacked 1365 W To the above figures add the following as they apply to the lineup Table 3 11 Heat Loss per Section SecoGear Sections or Component Heat Loss Each vertical section with simple typical relaying and control 150 W Each vertical section with complex r...

Страница 33: ...ors generators and metering will be covered Protection considerations can be provided by single phase or multifunction three phase relays which may include phase and ground directional non directional relays overcurrent differential directional power under frequency and under overvoltage relaying Many benefits are provided by newer multifunctional digital relays expanded relay functions digital me...

Страница 34: ...tem and Equipment Protection 26 2017 General Electric All Rights Reserved The GE Multilin website provides an easy reference to various relays and metering options available to you for use in your SecoGear equipment Figure 4 1 Multilin Website Features Motor Protection Selection ...

Страница 35: ... SecoGear Medium voltage Switchgear Application and Technical Guide System and Equipment Protection 2017 General Electric All Rights Reserved 27 Figure 4 2 Multilin Website Features Digital Metering Selection ...

Страница 36: ...nsidering among other things cold load pickup and other circuit requirements Instantaneous phase overcurrent relays for industrial or commercial building radial circuits are usually set high enough but well below the available short circuit current to prevent false tripping for faults at the lower voltage terminals of large transformer banks and to provide selectivity with groups of large motor st...

Страница 37: ...ed wye wye or wye broken delta with indicating lights or voltmeters can be used to indicate the presence of a ground fault on an otherwise ungrounded system Incoming Lines Incoming line ground over current relay protection consists of either a residually connected relay 51N or a relay 51G connected to a current transformer in the transformer neutral ground connection Ground sensor relaying 51GS on...

Страница 38: ...se relationships between voltage and current to determine the direction of current flow While earlier electromechanical directional overcurrent relays usually had only one time current characteristic digital multifunction versions are available in three phase and ground if desired packages with inverse very inverse and extremely inverse and other characteristics that are field selectable Direction...

Страница 39: ... are used to protect both the motor and its feeder cable These schemes use three CTs on each side of the motor Transmission Line Line differential protection 87L for short lines and important tie lines between medium voltage switchgear lineups is obtained by using transmission line relays These relays compare the currents at each end of a two terminal line These high speed relays are sensitive to ...

Страница 40: ...te to the use of the A60 system is the GE Multilin 8 series relay along with the optional Arc Flash module with optical sensors The 8 Series relay and arc flash sensors will detect light from an event and send a signal to trip your breaker The 8 series relay uses a combination of light detection and overcurrent to reduce false indications by some non event light source Consult the GE Grid Solution...

Страница 41: ...of the feeder circuit conductors Current transformer ratios selected in this manner permit settings of circuit overcurrent protective relays to provide good selectivity and protection For a properly designed circuit operating at full load this means a maximum scale reading of between half and three quarter scale For a circuit that provides for substantial future expansion lower scale readings will...

Страница 42: ...oved from the block Surge Protection Every medium voltage AC power system is subject to transient voltages in excess of normal operating voltages There are many sources of transient voltages The most prominent ones are Lightning Physical contact with a higher voltage system Resonant effects in series inductive capacitive circuits Repetitive restrikes intermittent grounds Switching surges To mitiga...

Страница 43: ... Power FACTOR RELAY 56 Field application relay 57 Short circuiting or grounding device 58 Rectification failure relay 59 Overvoltage relay 60 Voltage or current balance relay 61 Density switch or sensor 62 Time delay stopping or opening relay Device Function 63 Pressure switch 64 Ground detector relay 64REF Restricted earth fault differential 64R Rotor earth fault 64S Stator earth fault 65 Governo...

Страница 44: ...Impedance fault detector HMI Human machine interface HST Historian LGC Scheme logic MET Substation metering PDC Phasor data concentrator PMU Phasor measurement unit PQM Power quality monitor RIO Remote input output device RTU Remote terminal unit data concentrator SER Sequence of events recorder TCM Trip circuit monitor LRSS Local remote selector switch SOTF Switch on to fault ...

Страница 45: ...centers one or more branch circuit distribution centers or any combination of these two types of equipment A general purpose feeder includes circuit overcurrent protection circuit current indication and circuit control Transformer primary feeders Transformer primary feeder TPF is similar to a general purpose feeder except the entire load is one transformer and often includes differential protectio...

Страница 46: ...bination of these centers Protective Scheme Selection GPF 1 Use this type of feeder for systems that are impedance or solidly grounded and for which selectivity is not required with downstream residually connected ground relays GPF 1 feeders include three phase overcurrent protection 50 51 and one instantaneous overcurrent element 50GS connected to a ground sensor CT GSCT GPF 2 Use this type of fe...

Страница 47: ...ocharged capacitor trip device for each circuit breaker in the lineup Remote Control For circuit breakers controlled from a remote location choose the remote control scheme from those listed in Table 4 1 From this table Scheme C is recommended since it provides maximum operating flexibility It requires the use of a breaker position switch in conjunction with the breaker control switch to provide t...

Страница 48: ...T60 Optional Equipment Selection Options for a transformer primary feeder are the same as for a general purpose feeder except that automatic reclosing is not used Select options for TPF 1 TPF 2 or TPF 3 on the same basis as for GPF 1 GPF 2 or GPF 3 see GPF Protective Scheme Selection above Figure 5 2 Transformer Primary Feeder SINGLE SOURCE INCOMING LINES SSIL OR DUAL SOURCE WITH NORMALLY OPEN TIE...

Страница 49: ...of three current transformers For impedance grounded systems with larger transformers and for which three phase transformer differential relaying is not sensitive enough to detect secondary ground faults include ground differential relay protection 87TG with a single function GE Type IFD relay or as part of a complete multifunction transformer protection package Bus Differential Protection For sys...

Страница 50: ... plus an auto charged capacitor trip device for each circuit breaker and each lockout relay 86 in the lineup For dual sources with normally open tie circuit breaker and AC control add CPT throwover contactor Remote Control For circuit breakers controlled from a remote location choose the remote control scheme for those listed in Table 4 1 From this table Scheme C is recommended since it provides m...

Страница 51: ...ble in a single relay package such as the GE 850 F650 or F60 relays There are additional functions available as required Optional Equipment Selection Protection Overcurrent Relay Characteristics Time current characteristics for overcurrent relays are determined by system studies After the time current characteristic has been established make sure the relays selected offer the required time current...

Страница 52: ...t included in a bus tie is a circuit breaker control switch and indicating lights Optional Equipment Selection Protection Overcurrent Protection For systems requiring overcurrent protection relays for bus tie equipment specify incoming line overcurrent relay s 50 51 to be wired for a summation current connection If residually connected ground over current relays 51N are required with an incoming l...

Страница 53: ...rrent transformers if no CTs are present for overcurrent relaying an ammeter and an ammeter switch or a digital three phase ammeter Test Blocks For circuits that require the provisions for insertion of portable recording meters or other similar devices add current and voltage test blocks Basic current test block is wired to maintain the circuit when the test plug is removed Indicating Lamp Additio...

Страница 54: ...nt block is wired to maintain the circuit when the test plug is removed Figure 5 6 Bus Entrance INDUCTION MOTOR FEEDERS IMF Induction motor feeders are used to control and protect full voltage start motors and are designated as branch circuit protective equipment Economics usually preclude protecting a motor smaller than 1500 HP IMF1 with a device package as complete as one used for larger motors ...

Страница 55: ... The CTs located at the motor and used for the motor differential 87M circuit are typically furnished by the motor manufacturer They are not supplied with the switchgear For lineups with bus differential protection add three current transformers For motors with RTDs the GE Multilin 869 369 and 339 digital motor protection relays offer RTD sensing inputs Indication Instrumentation and Metering For ...

Страница 56: ...SecoGear Medium voltage Switchgear Application and Technical Guide DET 882 SecoGear Switchgear Applications 48 2017 General Electric All Rights Reserved Figure 5 7 Induction Motor Feeder ...

Страница 57: ...uipment Economics usually preclude protecting a motor smaller than 1500 HP SMF1 with a device package as complete as one used for larger motors SMF2 Also see IEEE C37 96 2012 IEEE Guide for AC Motor Protection for relaying recommendations Protective Scheme Selection SMF1 Basic equipment for an SMF 1 1500 HP and less includes three phase running overload locked rotor and short circuit protection 49...

Страница 58: ...can be sourced and mounted in a switchgear compartment or section These application panels are considered custom design Indication Instrumentation and Metering GE Multilin 869 provides extensive metering capabilities For circuits requiring additional or separate metering add a GE PQM II power quality meter which includes indication of all three phases of load current in addition to Volts Watts Var...

Страница 59: ...DET 882 SecoGear Medium voltage Switchgear Application and Technical Guide SecoGear Switchgear Applications 2017 General Electric All Rights Reserved 51 Figure 5 9 Synchronous Motor Feeder ...

Страница 60: ...itchgear Application and Technical Guide DET 882 SecoGear Switchgear Applications 52 2017 General Electric All Rights Reserved STANDARD BREAKER AND AUXILIARY CONFIGURATIONS Figure 5 10 Sample Lineup A Figure 5 11 Sample Lineup B ...

Страница 61: ...r Applications 2017 General Electric All Rights Reserved 53 STANDARD TIE BREAKER AND AUXILIARY CONFIGURATIONS Figure 5 12 Tie Breaker and Aux Tie Stack Figure 5 13 Bus VTs on Each Side of Tie Breaker Figure 5 14 Feeder Breakers in Upper Compartment Figure 5 15 Bus VT in the Aux Tie Compartment ...

Страница 62: ...us VTs connected on each side of the tie breaker Each feeder breaker is shown with relaying CTs and GSCTs The main breakers are shown with two sets of CTs and incoming surge arrestors Incoming source connections are shown entering from above The main breakers can also be arranged on the ends of this main tie main arrangement allowing for more options when either hot or cold sequence Utility meteri...

Страница 63: ... 5 through Figure 1 26 SecoGear is equipped with grounded metal shutters in front of the primary bushings The shutters are automatically operated by the circuit breaker movement When the circuit breaker is racked out to the Test or Disconnect positions the shutters automatically close to isolate the fixed primary contacts See Figure 6 1 for shutters in closed position Figure 6 1 Breaker Compartmen...

Страница 64: ...Cell Visual Breaker Position Indication The breaker compartments are provided with a visual indication for breaker position The indicator shows whether the breaker is in the Disconnected Test Intermediate or Connected position by color See Figure 6 3 Figure 6 4 and Figure 6 5 Figure 6 3 Breaker Position Disconnected Green Figure 6 4 Breaker Position Intermediate Yellow Figure 6 5 Breaker Position ...

Страница 65: ...s SecoGear is designed with a number of interlocking systems to help prevent improper operation The circuit breaker can be moved from Test to Connect or service position and vice versa only when the circuit breaker is in the Open position The secondary disconnect plug can be inserted or removed only when the circuit breaker is in the Test position The circuit breaker cannot be closed when it is in...

Страница 66: ...ck out and tag out procedures and safety Front and rear doors are offered with padlock provisions as shown in Figure 6 11 and Figure 6 12 Figure 6 11 Rear Door Padlocking Provision Figure 6 12 Front Door Padlocking Provision Breaker compartments are provided with padlocking to prevent unauthorized racking of circuit breakers The racking mechanism access can be locked shut as shown in Figure 6 13 F...

Страница 67: ... The option of other materials for bus hardware and ratings is not offered Secondary Control Door mounted Devices Protective relays meters instruments controls switches indicating lights and test blocks are typically mounted on the compartment front doors Devices are mounted accordingly to the breaker they are associated with If there are more devices associated with a particular breaker than the ...

Страница 68: ...d Wiring For standard applications a No 14 tinned copper wire rated 600 V will be used for secondary control wiring Some applications or circuits might require a larger wire Secondary control wires can pass around primary compartments through enclosed grounded metal troughs Standard wire ends are furnished with crimp type uninsulated spade terminals and sleeve type wire markers Power Termination C...

Страница 69: ...ed baked on polyester powder coat of Light Gray ANSI 61 Dry Film Thickness Between 2 0 4 0 MILS 60 in lbs direct impact resistance Unit Nameplates Each unit door is furnished with a nameplate specifying ratings of the section Each nameplate is Each nameplate is 76 2 mm x 115 89 mm 3 in x 4 56 in white text on medium grey background Accessories Breaker Test Box A Test Box is used to electrically op...

Страница 70: ...identify SecoVac breakers and equipment Each breaker is provided with a label specifying ratings and identification number on the front cover Each lineup has a metal equipment rating identification nameplate on the front lower left hand base channel Inside of the front cover of each breaker is a barcode label identification label Figure 6 26 Figure 6 27 and Figure 6 28 show identification methods ...

Страница 71: ...e properly done with a minimum of M12 1 2 in Grade 5 bolts in specific locations See anchoring details in Figure 6 30 SecoGear requires a SecoVac VB2 circuit breaker able to operate under fault conditions that cause a shock stress approximately 1 1 2 times the static load The weight of the switchgear structure and the shock stress caused by the opening of the breakers require a strong foundation o...

Страница 72: ... channels shall be level with each other This is critical to prevent distortion of the equipment and to ensure proper mechanical and electrical connections between shipping splits and close coupled equipment 2 The finished floor shall be slightly pitched away from the mounting channels Ensure pitch does not exceed flat and level requirements 3 The foundation must be flat and level in all planes pe...

Страница 73: ...oring Method Figure 6 33 Installation Top View Conduit Leads Embedded Channel C5 x 6 7 min Clearance Space 2Ø 18 0 mm 0 709 in Holes for M12 0 5 in Anchor Bolts Front Rear 35 05 mm 1 38 in 25 4 mm 1 0 in max Conduit Leads Embedded Channel C5 x 6 7 min 2Ø 18 0 mm 0 709 in Holes for M12 0 5 in Anchor Bolts Front Rear 35 05 mm 1 38 in 25 4 mm 1 0 in max Front Door 914 4 mm 36 in required min space fo...

Страница 74: ...ism therefore it has no interrupting or closing capability SAFETY The Ground and Test Device is often used during initial installation and for troubleshooting when the possibility of making an error is greatest The Ground and Test Device and the metal clad switchgear have interlocks to prevent unsafe operation Unfortunately it is not possible to eliminate every hazard with interlocks therefore is ...

Страница 75: ...DET 882 SecoGear Medium voltage Switchgear Application and Technical Guide NOTES 2017 General Electric All Rights Reserved 67 NOTES ...

Страница 76: ...Company Information provided is subject to change without notice Please verify all details with GE All values are design or typical values when measured under laboratory conditions and GE makes no warranty or guarantee express or implied that such performance will be obtained under end use conditions DET 882 85 ...

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