General knowledge Flashcards
13,800 V 25,000V 115 KV 230 KV 345 KV
2)-What is the difference between a radio 5K circuit and a network 5K circuit?
Hey 5KV radio circuit has one source station and therefore feed only in one direction 85KV networks Circuit feeds from to source stations most commonly referred to P and use primary Netwerk units giving it a two way feed
3)-From the appropriate prints examiner will ask you to identify and explain the different lines and symbols of each of the following 15 KV circuit print 5KV circuit print secondary sheet secondary network sheet construction sketch Netwerk feeder
Go to the prints
4)-Describe the secondary networks system from the substation to the customer service.
The secondary Network Systems supplied via 13,800 volts networks feeders which originate from one of six networks substations station 2,12 ,53 ,71 ,492 and 514 the feeders supply network transformers in either a secondary Netwerk vault or tertiary network vault voltage is step down to one 120/208 or 277 /480 V it is then distributed normally by 4/0 seven wire mains or 500 MCM 4 wire main through manholes and eventually to the customers prem
6)-Describe the method of numbering DSS lines
DSS lines the number of the station that is being supplied followed by a hyphen, after the hyphen , lines under 19,999 V will be numbered 51 through 299, or 1000 through 1999 with the voltage identification number 1 directly following the hyphen lines from 20,000 to 29,999 will have a four digit number directly following the hyphen the first digit being 2
Describe the method of numbering 5kVA Distribution circuit
5KV Distribution circuit numbered for the station where they originate followed by a hyphen, the number of the Circuit assigned 1 through 24 distribution Circuits, 25 to 50 are series circuits .th hyphen is iomitted when the originating station is only two digit. Between primary Netwerk units (PNU) identify with the letter N between the PNU numbers ( lowest number first, highest number second)
4)-Describe the method of number in Cambridge lines
800 series are reserved for the Cambridge DSS lines
120/208 volts and 277/480 volts
###7)-Identify the following a 126–04 B 3606 C 101–104 D875-1312 E 2–1n33 F 292-h7 G 6 N 7 H 110-2211
A 5KV radio distribution circuit B 5KV radio distribution Circuit C 15 KV distribution system supply line
D 15 KV Cambridge Distribution system supply line
E 15 KV secondary Netwerk Feeder
F 15 KV distribution Circuit
G 5K the primary Netwerk Circuit
H 25KV distribution system supply line
A system change notice is the form used to notify the system operator of any changes on the system. It is required when new or changes of equipment are connected to the system that were not already documented. Normally system changes are communicated through the permit process and documented. When work is performed outside the permit process the system change notice services to update the records for the system operator and is required . (See(OG-3B)
A 5Kv
B 15 KV
C 25KV
A 4160 V, 2400 V
B 13800 volts, 7960 V
C 24,000 V, 13,870 V
10 how are the individual phases of a circuit identified?
A)5K V phases A-B-C and system ground (D leg)
B)15 KV phases A-B-C
C)25KV phase C-A-B
11) to what conductors of a 5KV circuit are the single phase leads of a transformer connected?
There are three possible combinations
A system ground (D-leg)
B system ground (D-leg)
C system ground (D-leg)
12 ) to work conductors of a 5KV circuit are three phase transformers connected for the following installations :
- conventional transformer
- Fuse typed transformer
- padmount transformer
A )conventional transformers A-B-Cphase wires only NO D-leg connection
B) Fused type transformers
A-system ground B-system ground C-system ground
(three individual ground required for each transformer)
C) pad mount transformers A-B-C only ;with bonding to system ground and a driven ground rod
Clerance- will be given when a zone of protection can be established :using visible brakes and grounds surrounding the work area .clearance tags are applied to all open points of known sources
and caution tags applied to identify devices in off schedule position
Permission is given when a zone of protection is established .
- without visible breaks
- grounds are not installed surrounding the work area.
work must be tested deenergize and performed using live line methods
Construction tags
are white tags
they shall be installed on new Eversourse equipment or new customer equipment during the construction.
That is not under the jurisdiction of the system operator
a caution tag is required at the disconnect point of demarcation between the construction and the equipment under the jurisdiction of the system operator
14)explain what disconnection of ground you would expect to have between a live bus and your work in the street on a circuit which has been Deenergize and tag buy you A)-5K V distribution circuit
A) 5KV distribution Circuit :
The Zone of protection will be established by
opening all devices surrounding the work
-installing permission tags on all known sources
- caution tags will be use on all open points that are not known sources and devices that are off schedule
14)- B15 KV Distribution circuit
15 kVA Distribution circuit: the zone of protection will be established by
opening devices surrounding the work area and installing Clerance tags
grounds will be installed at the closest point of the work to be performed when practical
14)-C secondary Netwerk feeder
C)-secondary network feeder
-all protectors will be confirmed open by testing the feeder dead back
-primary switches will be confirmed in the ground position at the closest point surrounding the work area and the feeder will be grounded at the station cubicle
#stations go to primary switch and verified#
15)-Explain the rubber glove rule as it pertains to the underground
Protective gloves are required as directed in the employee safety manual (section 8.5 sub par a - M)
-class 1 gloves are required for liveline method on four KV circuits
-class 2 gloves are required -when employees are operating 5KV oil switches remotely
-gloves required “lock door to lock door” for energize switchgear or enclosures -when employees are working on secondary cable that is or may become energized at 50 V or above
-when using or holding any test equipment that is or may Become energize at 50 volts ir above
explained are listed in section 8–5.2 subpar A- F
16) what protective clothes are required when performing switching operations on pad mount equipment
Hardhat
- 40 cal switching coat and coveralls
- rubber gloves
- safety glasses
- arc rated face shield
17)-how are fall indicators identified on a circuit print?
A) FA auto reset type
B) FM manual reset
18)-what side of the switch would fall indicators be installed on?
Fall indicators should be placed on the load side of the switch
19)-what protective clothes are required to operate a 5KV oil switch in a manhole?
- Hardhat
- 40 Cal switching jacket and coveralls
- rubber gloves class 2
- safety glasses
- hooded arc rated face shield
53-53rd station feed 1- 13,800 volts N- Network 2 - bus section 2 4 - cubicle#4
21)-who should be notified before taking an unscheduled outage?
You should notify your immediate supervisor or the control desk and assistant system operator .
(system operator will send out a customer blast to notify of outage)
22)-explain the procedure for proving cable and equipment deenergized
You should exhaust all available identification resources using applicable documents and devices
and cut to prove using grounded cutters from a remote location
Automatic reclosing devices.
- they react to the fault current .
- opening upon seeing fault current and then will reclosing after a specific number of times.(usually once in the underground)
- if the fault has cleared the circuit will reclose and staying in
- If the fault is still present the Circuit will reclose, see the fault reopen and lockout (overhead typically is three) (times and typically 10 second delay)
What is a VP1
VP1 is a voltage probe indicator.
direct contact voltage detector
- indicates voltage present greater than 50 VAC up to 600v
What is a tic tracer
- Tic tracer can be used on a bare conductor and a capacitive test point
- it has two settings the lowest setting detects voltage between 24 V and above the high setting detects 1000 V and above
Explain what wiggy’s are?
- Wiggies can be used on bare conductor only.
- it detects voltage between 120 V and 600 V
What is a LV-5?
The LV-5( low voltage detector )
-is a handheld direct contact tool
-capable of detecting voltage present as low as 5 V
(LV -5S is similar and use for stray coltage) detection
What is the HD Mark 5?
HD Mark 5 is also known as the 5/15 meter
-it is a meter used on bare conductor only
It can detect voltage from 1000 V to 15,000 V
-it can be used for phase to ground as well as phase to phase measurements
What is a HD proof tester?
The HD proof tester is an instrument that can be used to test the 5/15 phasing meter ,before and after the actual testing of the equipment in question ,in the event that there is no known energize source available
What is the HD DVM 5–3
It is a three phase voltmeter (Hayhurst box )
- it is a direct contact inductive device used to identify voltage present on the 5KV system
- it is designed to be applied on Deenergize cable and read tested results from a remote location went energized
What is a HD PB 300?
The PB 300 phasing meter also known as the Shannon box
- is an inductive noncontact test device
- used to compare phases of energize cable on the 5KV system
- it is designed to be applied on deenergize cable and read test results with remote location when energized
What is a fluke amp meter?
The combination volt/amp meter( fluke )
- is a direct contact positive digital test device
- can be used to take voltage or load readings
- it is not the preferred device for phase bank applications and is limited to 600 V AC
What is the multimeter ?(Simpson, triplet)
The multimeter is used on bare conductor only
for voltage measurements.
-it is very accurate and is the preferred instrument for taking secondary readings .
-models different but usually the voltage range is from 0 to 1000 V AC
-the multimeter also is capable of measuring DC voltage and resistance
25)-Explain or demonstrate the use the Bierer phasing tool in the following applications a cable identification :
of a
-distribution system supply line
- Tool sends Test current for phase and cable Identification. -grounds are applied beyond the point of identification and Sender ( Bierer tool) is applied before the point to be identified .
- test current is read by portable CT to obtain clear identification of test current signal on all conductors to be identified .CT is directional as required the user to apply it in the intended direction
25)-Explain or demonstrate the use of the bierer phasing tool on how to :
identify a 13.8 kv network feeder
Multiple grounds may be applied and the test current (Beirer tool )is applied ,signal loss may be experienced .
- the device can be applied independent of ground return -the test current can be sent out on two phases and returned on the third
- CT is directional and requires the use it to apply it in the intended direction
26 )-what can happen if a generator is connected to the system ?and how are the hazards medicated ?
A)customer owned
B)Eversourse installed
Normally any generator that is permanantly attached to customer service is equipped with a disconnect /throw over switch .which prohibits tying a generator into our system .
-however if a customer improperly attaches a generator without opening his main disconnect a possibility exists that the generator voltage usually (120/240) could be transferred onto our system and normal step down transformer would act as a step up transformer and deliver primary voltage into a system that we believe to be deenergized.
Standard W5114 in process
27)-Who is responsible for phasing on a 5KV circuit? Who must prove and discharge the cable after live phasing?
The delegate in charge is responsible for the correct phasing of a 5K be distribution Circuit this is typically the construction inspector but maybe another qualified and authorize employee such as a trouble Shooter.
Responsibility for properly marking and then discharge the cable vefore any work xan be preformed
28 )-what are the two main types of 600 dead break elbows in use on our system ?explain how they are similar or different in respect to the following:
installation
and removal
The two main type of 600 amp Elbows used in our system are the
-Visibreak elbow system with the multi lamb connector
-the T-OP 11 system which utilizes the LRTP.
A)-the two assemblies totally different.
the components of the T-OP11 include cable adapter. connector, LRTP and housing .
the visibreak consist of cable adapter, connector, contact tube, multilamb and housing with 200 amp interface .
-virtually no parts of this is compatible with each other.
visibreak is easily identified by orange band around the T- body .
B)-on the visibreak elbow ,a different wrench is required for both construction or installation and removal .
-The T-OP11 utilize the same wrench to perform both function .the T-OP 11 elbow also requires the preliminary installation of a brass threaded male insert into the apparatus bushing of the equipment to be used . short of brass fitting should be securely tightened into the bushing.
