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Type HCB-1 Pilot Wire Relay System
Perform the tests as indicated in Figure 9 recording
the milliammeter readings and the relay input current
at the same instant, for future reference. The head-
ings "Circulating" and "Remote" in the table of Figure
9 refer to the test switch positions, "CIRC" and
"REM." For tests 3 to 6 of Figure 9, the input current
should be increased to about 1.5 amperes by an aux-
iliary current transformer, if the secondary load cur-
rent is below this value. Also record the input and
output readings with the test switch in the "Local"
position. Typical values for the "Local" position read-
ings are shown in Figure 13.
9.3.
THREE TERMINAL LINES
A similar procedure to Figure 9 should be followed
for three-terminal line applications. In this case open
the line circuit breaker at one terminal, and discon-
nect the leads from the pilot-wire terminals to the
insulating transformer (open H1 and H4) at the that
terminal. This leaves the remaining position of the
line operating as a two terminal line. Now perform the
normal tests as outlined for the two terminal line sys-
tem test. When these tests have been satisfactorily
completed, return the third terminal relay to normal
and close the breaker at that station. Repeat the
above procedure with a different breaker open and
relay disconnected. This will complete the check of
the three terminal line.
9.4.
ENERGY REQUIREMENTS
The volt-ampere burden of the type HCB-1 relay is
practically independent of the pilot-wire resistance
and of the current tap used. The following burdens
were measured at a balanced three-phase current of
5 amperes:
Relay
Phase A
Taps
VA
Angle
A-F- 4
2.4
5°
A-H- 10
3.25
0°
B-F- 4
2.3
0°
B-G- 4
3.98
0°
B-H- 10
4.95
0°
C-F- 4
2.32
0°
C-H- 10
6.35
342°
Phase B
Phase C
VA
Angle
VA
Angle
0.6
0°
2.5
50°
0.8
100°
1.28
55°
0.63
0°
2.45
55°
1.28
92°
.88
42°
2.35
90°
0.3
60°
0.78
0°
2.36
50°
3.83
80°
1.98
185°
Relay
Phase A
Taps
VA Angle
A-F- 4
2.47
0°
A-H- 10
7.36
0°
B-F- 4
2.45
0°
B-G- 4
16.82 9.90°
B-H- 10
16.8
55°
C-F- 4
2.49
0°
C-H- 10
31.2
41°
The angles above are the degrees by which the current lags is
respective voltage.
The continuous rating of the relay is 10 amperes.
The two-second overload ratings of the relay are 150
amperes phase and 125 amperes ground currents.
9.5.
PILOT-WIRE ENERGY
The current and voltage impressed on the pilot-wire
do not exceed 100 milliamperes and 60 volts. The
wave form and magnitude of the pilot-wire current
are such that telephone interference is within the lim-
its allowed by the local operating telephone com-
pany. This permits the use of leased telephone lines
as a pilot-wire channel.
10.0 RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to users who are equipped for doing repair
work. When ordering parts, always give the complete
nameplate data.
41-971.3M
Phase B
Phase C
VA Angle
VA Angle
2.110°
1.97
20°
12.553°
6.7
26°
2.0915°
2.07
10°
16.7913.5°
15.10 4.0°
22.050°
12.3
38°
1.9915°
2.11
15°
36.038°
23.6
35°
17
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