phase-comparison carrier-pilot relays general electric

58 Pages·2010·5.23 MB·English

INSTRUCTIONS
GEI-44070A
PHASE-COMPARISON
CARRIER-PILOT RELAYS
TYPES EDDI2D
AND EDDI2E
A
LOW VOLTAGE SWITCHGEAR DEPARTMENT
GENERAL ELECTRIC
PHILADELPHIA, PA.
CONTENTS
PAGE
INTRODUCTION (SECTION A) 7
Al APPLICATION 7
A2 RATINGS 7
A3 Relay 7
A4 Target-Seal-In Unit 7
As Contacts 8
A6 A-C Test Source 8
A7 BURDENS 8
Ag Loads Imposed By Re ay 8
A 9 Relay Tripping Ranges and Settings 8
RECEIVING, HANDLING AND STORAGE (SECTION B) 9
DESCRIPTION (SECTION C) 9
C 1 RELAY TYPES 12
C2 CASE 12
C3 SEAL-IN UNIT 12
INSTALLATION (SECTION D) 12
DI LOCATION 12
D2 MOUNTING 12
03 CONNECTIONS 12
INSTALLATION TEST AND ADJUSTMENTS (SECTION E) 13
El D-C Polarity (Check) 13
£2 Target Tap (Set) 13
E3 Trip Circuit (Cheek) 13
E4 Alarm Circuit (Check) 13
E s Test Source Current e 13
E6 Type EDD12D Relay Panel Mounted 13
E7 Type EDD12E Relay Sub-panel Mounted) 16
Eg Phase-Fault Detector (Set FD-1 to FD-3) 16
Eg CT Connections (Check) 16
£10 Heater Adjustments, Network Unit (Set) 17
E 1 1 Heater Adjustments, Tripping Unit (Set) 17
£12 Power Amplifier Plate Current (Check) 17
EIS Signal Alarm and Comparer Plate Current (Se ) 17
£14 Signal Alarm Current (Check) 17
E ls Reserve Signal (Set). 17
E16 Phasing of Test Sources (Check) 20
El7 Phase Shifter (Set) 20
E18 Comparer Plate Current (Check) 20
Elg CT Phase and Polarity (Check) 20
E20 Phase-to-Phase Blocking Point (Set) (FD-L) 23
E21 Phase-to-Phase Trip Point (Set) (FD-H) 23
£22 Ground Current Pickup (Set) 23
E23 Output Voltage and Signal Strength (Record) 24
E24 Transient Blocking RB (Check) 24
E25 Ground-Current Pickup (Check) 25
£26 Network Balance (Check) 25
E27 Three-Phase Trip Point (Check) 25
E28 Three-Phase Load (Check) 29
OPERATING CONDITIONS (SECTION F) 29
Fl POWER SUPPLY 29
F2 TEMPERATURE 29
CONTENTS (Cont'd.)
PAGE
PRINCIPLES OF OPERATION (SECTION G) 29
29
G1 OPERATING PRINCIPLE
30
GG23 NETWNeOgRatKiv Ue-NPIhTa s e-Sequence Network 30
Positive-Phase-Sequence-Output for Three-Phase Faults 30
G4 30
G5 Output Filter
30
G6 Voltage Amplifier
G7 Fault Detector - Low (FD-L) 30
G8 Fault Detector - High (FD-H) 31
31
G9 TRIPPING UNIT
31
G10 Power Amplifier
31
Gll CPhoamsep aSrheirf taenrd Tripping Re ay Element 31
G12 31
G13 External Fault
31
G14 Internal Fault
Signal Alarm and Signal Alarm-Relay Element, SA 31
G15
Transient Blocking-Relay Element, RB 34
G16
34
G17 Seal-In Unit, SI
34
G18 D-C TEST EQUIPMENT
34
G19 A-C TEST EQUIPMENT
35
RELAY SETTING (SECTION H)
35
HI LIMITING CONDITIONS
H2 Tapped Lines. . . . , . . . 35
35
H3 METHOD OF CALCULATION
H4 Ground Current Tap Setting 3356
115 EXAMPLE OF CALCULATION
36
HH76 EExxpalmanpatlieosn. . , , . . , . , . . . 36
H8 TABULAR METHOD OF CALCULATION 41
FACTORY TEST AND ADJUSTMENTS (SECTION J) 43
43
II. NETWORK UNIT
43
72 Balancing the Network 43
13 Fault Detector - Low (FD-L)
14 NFaeutwlt oDrke tBecatloanr c-e H Cighehc (kF (D0- tHo )p Pickup) 4433
1156 Phase-Fault Detector Pickup (F01-3) 43
17 Fault Detector (FD-H) Three-Phase Pickup 44
44
18 Tube Replacement
44
19 Voltage Amplifier
nIlOl TRIPSPigInNaGl A UlaNrmIT - . R. e. l.a y Elem.e n.t, S.A . . . ................... 4444
44
/12 FD-L and FD-II 44
T11143 TTrriapn-sRieenlat yB Elolecmkienngt ,R TeRlay Element, RB 44
44
115 PPorowceerd Aurme pfloifri eTre lephone Relay Adjustment 45
116
45
MAINTENANCE (SECTION K)
45
K1 PERIODIC TESTS
45
K2 Procedure for Test
45
K3 Check of Tripping
45
K4 Check of Blocking
K5 Tubes. , . . . . , . 46
K6 CONTACT CLEANING . ......... . 45
RENEWAL PARTS (SECTION L) . . • ................ . . . 46
47
LI ELECTRICAL SPARE PARTS LIST
48
L2 REFERENCE COMPONENT VALUES
4
Mee Comparison Carrier Pilot Relay Type EDD DEI-44070
11111,WMANMIAIIIMIWIa

-
RESISTORS L R
R-205, R-206,
R-227
T-202
CRADLr
3
TAP BLOCK T-202
TEST JACK J-201 R-20I
•49
7a
1 FD-H ADJ R-221
at SELECTOR SWITCH S.201 = C-204, C-203,
C-202
FO-L AD') R-209, R-210
RESISTOR STRIP = C-201
M201 T-8 _ RS-201
R-222
R-223
••••• R-208
R-207
R-202 R-224 L-203
• R-203 R-212
R 230 R-2I8 R 228
R-217
R-211
F0-I
E=W
F D-2 PJC
F0-3
ARMATURE 1AI
T- 201
INNER BLOCK
liesr LATCH
Fig, I network Unit Withdrawn From Case
5
GEI-44070 Phase Comparison Carrier Pilot Relay Type MD
INNER
BLOCK
CRADLE
SEAL-34
UNIT
T- 203
TEST SWITCH
j-202
SELECTOR
PHASE r3TO r 0-206 CC- 221112
SH if TER C-207 C
CONTROL C-2I0
R-253
V 205
204 v-204
v- 203
RESISTOR
STRIP L-R
R-244 R-233, R-234
R-256,RG-204
R-246 R-235 R-251, R- 252
R-232 R-239
MALE PLUG
SA IRLUG-IN
TELEPHONE pc__ UNIT1
RELAY UNITS
R-236
LATCH
Fig. 2 Tripping Unit Withdrawn From Case
PHASE COMPARISON CARRIER PILOT RELAY
TYPE EDD12D AND TYPE EDD12E
INTRODUCTION (SECTION A,
For three terminal lines, the addition of ground
The Type EDD relay is a phase comparison re-
excitation requires special consideration.
lay designed primarily to provide instantaneous
di ferential protection for transmission lines. COMBINED DIRECTIONAL AND PHASE COMPAR-
The carrier current relaying system using this ISON RELAYING
relay, is a differential system comparing the phase Provisions are incorporated in the phase-com-
angles of the currents entering and leaving the pro- parison relay for its use with directional-comparison
tected transmission line section. Comparison is relays. This application is for medium and Longer
made by means of a carrier current channel. length lines, where distance-type relays may be used
to advantage for phase relaying; while, because of
APPLICATION
A1 mutual induction with parallel lines, the phase-com-
parison relay will be selected for ground faults.
These relays ar e protective devices used t o
close trip circuits whenever a predetermined value TELEMETERING-SUPERV1SORY CONTROL
of internal fault current is reached on transmission
As an auxiliary service the phase-comparison
lines with up to35 decibels attenuation tothe carrier
relay may be used for telemetering or supervisory
current. control.
Simultaneous tripping at all line terminals is
Telemetering requires an instantaneous signal
obtained when the values of the CT secondary cur- alarm (SA) unit as described in Section GIs.
rents exceed those listed in Table IV. Refer to Sec-
tion 03 to determine if tripping requirements are RATINGS
A2
fulfilled.
When back-up protection is required, supple- A3 Relay
mentary distance an d directional ground relaying The ratings of the phase-comparison relay are
must be added. given in Table I.
TWO TERMINAL LINES A4 TARGET-SEAL-IN UNIT
Protection is provided for, two-ended transmis-
sion lines, with or without tapped loads, providing The 2-ampere tap has a d-c resistance of 0.13
the conditions described in Section Hi and H2 are ohms and a 60 cycle impedance of 0.53 ohms, while
met. the 0.2 ampere tap has an 8.5 ohm d-c resistance
and a 52 ohm 60 cycle impedance. The tap setting
THREE TERMINAL LINES used on the seal-in element is determined by the
current drawn by the trip coil.
In some cases this relay may beused for three-
ended lines. The Type EDD relay has two fault de-
tectors to compensate for the possible two-to-one
TABLE I
ratio of fault current magnitude between the ends of
a three-ended line. The necessity of setting the
phase-overcurrent units abov e full-load current, PHASE COMPARISON RELAY RATINGS
plus the two-to-one r at i o mentioned previously,
raises the minimum tripping level. P ase current circuits,
continuously 5A, 60 cycles
GROUND CURRENT EXCITATION Phase current circuits, 1 sec 200A, 60 cycles
Applications requiring ground current excita- Phase current circuits, max.
ions f or ground faults on three-ended lines need RMS phase-to-phase 500A, 60 cycles
special consideration. Ground current circuit, 1 sec 200A, 60 cycles
The addition of ground current excitations for Ground current circuit,
two terminal lines is required where the minimum max. R MS SOOX tap setting
negative-phase-sequence current for internal ground D-c control circuit,
continuously 129 (or 258) V.
faults is less than 86 percent of the relay phaselo-
D-c control circuit, max.
phase trip setting. The method of calculating ground See Section F 140 or 280
current tap setting is described in Section 03.
These instructions do not purport to cover all details or variations in equipment nor to provide for every possible
contingency to be met in connection with installation, operation or maintenance. Should further information be desired
sufficiently for the purchaser's purposes, the matter should
or should particular problems arise which are not covered
be referred to the General Electric Company.
7
GEI-44070 Phase Comparison Carrier Pilot Relay Type EDD
As LOADS IMPCEED BY RELA Y
The 0.2 ampere tap is for use with trip coils
that operate on currents ranging from 0,2 to 2,0 am- The continuous load imposed by the re
peres at the minimum control voltage. If this tap is the source (129 or 259 roils) is 0.9 amperes,
used with trip coils requiring more than 2 amperes,
there is a possibility that the 8,5 ohm resistance will NOTE: This 0.9 ampere does not include the
reduce the current to so low a value that the breaker current drawn by the associated carrier'current
will not be tripped. equipment.
During tests and adjustments. the load imposed
The 2 ampere tap should be used with trip coils on the a-c test source can vary f to 6,6 amps
that take 2 amperes or more at minimum control at 115 volts, 60 cycles. The actual test value de-
voltage, provided the tripping current does not ex- pends on the phase to phase trip setting.
ceed 30 amperes total (two trip circuits) at the max- mal setting the test load would be 3,5 amps Par
imum control voltage. If the tripping current ex- ended lines and 6.5 amps for three-ended lines,
ceeds 30 amperes, an auxiliary relay should be used.
The connections should be such that th e tripping Ag RELAY TRIPPENG RANGES AND SETTLNGS
current does not pass through the contacts or coil
Thetrippingsettings, except for phase-Da-ground
of the target-seal-in element,
tripping with ground-current excitation, are contin-
uously adjust ab le within the limits specified in
TABLE
Table W. The relay is norrnallyset for values listed
SEAL-IN ELEMENT RATING in the "FACTORY" column.
AMPERES, AC OR DC TABLE IV
FUNCTION 2-Amp Tap 0,2 Amp Tap
0 Ohm) (8.5 Ohm) Type Fault Current Transformer Seconda4
Amperes For Tripping'
Crairprpyi nCgo Dntuitnyu ously 304 0.45 2 Terminal 3 To
OperationObei a
f
(Factory Max. Mm.i
A5 CONTACTS
The current-closing rating of the contacts is 15 3 p trip
amperes for each trip circuit or 30 amperes total, p FD, 4,0
for voltages not exceeding 250 volts. After tripping 0-0 Trip 2,0
occurs, the tripping circuit must be opened by an 0- 6 Trip I 4,0
auxiliary switch on the circuit breaker or by other
0.33- .
automatic means as the relay contacts are sealed 0-6 Trip wi th
1,33 i
closed when tripping current is flowing. Ground Excita-
ion"
A6 A-C TEST SOURCE Load
"CT secondary amperes, with ingle-en
The 15 second rating of the a-c test source is no grounding transformer on gar e side of relay as
6.5 amperes.
the fault.
BURDENS
If settings beyond tho nnver in Table IV are
The relay burdens are given in Table III.
required, refer to the Gener nc Compimy,
TABLE rn Phase-to-Phase Faults
FAULT CT BURDEN-OHMS The trip settings are obtained by adju,
rheostats FD-L (R209-R210 ganged)valid FD-H (R22 t
Phase Fault Z R + j X as outlined in Sections E20 and En. FD-R is nor-
Any CT 0.15 42 j 0.1 mally set 50 percent higher than FILL to provide
a safety margin between blocking arid tripping.
Ta p
Z R + j X
(Mult. by)
GROUND
FAULTS 2,0 0.23 /18, 0.22 + j 0.07 Three Phase Faults
(Burden 0,67 0,33 /36 0.26 + j 0,20 The trip settings are obtained
hpihgahofse es)t 11; 0.47 40 /44 0.29 + j 0,28 trhees ipshtoars eR f2a0u2l ta dndet FecFt-oHr sr hEeDos-tIa tt Ro 2F2L1 ,
correct operation, the r at i o between M-
0.33 0,52 /50 0,33 + j 0.40 END to FD-3 and ED-H must be kept
2 terminal lines and 3 to 8 for 3 terminal
0.23 0,74 /58 three phase trip setting will normally be abgrox
mately 2,7 Oates the average phase-to-blase trip
0,17 1,18 /66 0.47 + 3 1.0
setting. Adjustments are described in Section „Ty,
8
Phase Comparison Carrier Pilot Relay Type EDD GEI-44070
Phase-to-Ground Faults setting. When gr ound excitation is required the
• magnitude of K can vary from 0.17 to 0.67 (refer to
Tripping settings are adjusted by the selection Section 115 - Par. 17).
of taps on the ground current winding of transactor
T202. The tap setting selected depends on the mag- Phase Shifter Range
nitude of the negative sequence current available
during internal ground faults as described in Section The phase-shifter settings are adjustable from
H4. When ground-current excitation is not needed, 0 to 24 degrees. The extreme counterclockwise po-
K = 2 (refer to Section H6 - Par. 11). The product of sition of the rheostat E3 is the zero degree set-
K times 0-to-O trip setting equals the 1210-G trip ting. The switch clicks off in this position.
RECEIVING, HANDLING AND STORAGE (SECTION B)
These relays, when not included as a part of a packing the relay in order that none of the parts are
control panel will be shipped in cartons designed to injured or the adjustments disturbed.
protect them against damage. Immediately upon re-
ceipt of a relay, examine it for any damage sustained If the relays are not to be installedimmediately,
in transit. If injury or damage resulting from rough they should be stored in their original cartons in a
handling is evident, file a damage claim at once with place that is free from moisture, dust and metallic
the transportation company and promptly notify the chips. Foreign matter collected on the outside of
nearest General Electric Apparatus Sales Office. the case may find its way inside when the cover is
removed and cause trouble in the operation of the
Reasonable care should be exercised in un- relay.
CARRIER S A-C
TEST SWITCHES
TEST RESISTORS
TEST TAP
SWITCH
INDICATING TEST --= A -C D-C 0-C TEST TELEPHONE TEST CORD
LAMPS RHEOSTAT VOLTMETER MILLIAMMETER JACK JACK
Fig. 3 EDD Equipment For Panel Mounting
DESCRIPTION (SECTION C)
The relay consists of a network unit, tripping elements identified as FD-L, FD-H, T, RB and SA.
unit, two test s w it c hes (RTS and Ctrs), d-c test The d-c test equipment, Fig. 3 i s composed of a
equipment, and a-c test equipment. The network d-c milliammeter and a telephone jack mounted with
unit, Fig. 1, contains, in an L2 case, a negative- associated parts. The a-c test equipment, Fig. 3,
phase-sequence network, three phase-overcurrent consists of two tapped resistors, a tap switch, rheo-
relays, a v o It ag e amplifier, and fault detectors, stat, relay test switch, voltmeter, and an amber
low (L) and high (H). A heater resistor (11231) is indicating lamp. Also included are a carrier test
mounted externally. The tripping unit, Fig. 2, con- switch and a white indicating lamp. External resistor
tains, in a special 14 case of 23 studs, a power am- 11231 is not shown in Fig. 3.
plifier, RC phase shifter, and five telephone-relay
9
GEI-44070 Phase Comparison Carrier Pilot Relay Type EDD
11
12 ¶ 4 16
T- 203
R- 237 R- 247
R.2
R.2331 P. A
C. 210
PHASE
R- 251
C.213 C- 2Ic_ 21
L
S-202
SiLINT RES I STOR
SW;
• FOR Itfl
P24,4ETER
IC
C1RWITS
Fig. 4 Internal Connections For Type Elk Relay (Tripping Unit)
10
Phase Comparison Carrier Pilot Relay Type EDD GEI-44070

11 13 15 17 19
Fig. 5 Internal Connections For Type EDD Rel ay (Network Unit)
11