-------------------------------------------------------------------------------
| FUNCTION | SENSING | THRESHOLD | TIME DELAY | TRIPS |
|------------------|-------------|--------------|-----------------|-----------|
R | | CTs | + 15 A (min)| (min) | |
R | | Line CTs | | 10.0 seconds | |
R | | (Aux Gen) | | (max) | |
R |------------------|-------------|--------------|-----------------|-----------|
R |Delta Overcurrent | Generator | Delta I | Inverse Curve | GCR, PRR |
R |(DOC) | CTs | > 75 A (min) | (min) | |
R |------------------|-------------|--------------|-----------------|-----------|
R | Overload (OL) | Generator | APU Imax | 10.0 +/- 3 | None |
R | | CTs | + 15 A (min) | seconds | (Galley |
R | | Line CTs | | | Shed) |
R | | (Aux Gen) | | | |
R |------------------|-------------|--------------|-----------------|-----------|
R | Phase Sequence | POR | ABCN | 40 milliseconds | GCR |
R | (PSEQ) | | | (max) | |
R |------------------|-------------|--------------|-----------------|-----------|
R | AGC control | Line |Line Contactor| 300 milliseconds| GCR, PRR |
R | circuit failure | Contactor | Status | (max) | |
R | (AGCCF) | |disagrees with| | |
R | | | contactor | | |
R | | | "drive" | | |
R | | | command | | |
R |------------------|-------------|--------------|-----------------|-----------|
R | AGC failure | Generator | Generator | 160 milliseconds| GCR, PRR |
R | (AGCF) | current | current | (max) | |
R | | (after AGC | > 25 +/- 5 | | |
R | | commanded | Amps (after | | |
R | | open) | APU PR is | | |
R | | | open) | | |
R |------------------|-------------|--------------|-----------------|-----------|
R | Shorted/Open PMG | PMG | Open Phase or| 4.2 seconds | GCR |
R | | |Phase to Phase| (max) | |
R | | | Short | | |
R |------------------|-------------|--------------|-----------------|-----------|
R | Pin Programming |Parity error | N/A | 40 ms | PRR |
R | Error | | | | |
R -------------------------------------------------------------------------------
R 1EFF : 401-499, 1 24-23-00Page 19 1 1 Aug 01/05 1 1 1CES 1
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
C. Electrical Generation Interface Unit (EGIU) EGIU2 channel 2 is for the APU generator. Its main function is to give the main electrical parameters of the APU generator channel to the SDACS. This is via the ARINC 429 data links. For more details on the EGIU description and functions, refer to 24-22-00 .
R **ON A/C ALL
D. Power Contactor Refer to Chapter 24-22-00. E. Current Transformer (CT) **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,
(Ref. Fig. 001) **ON A/C 063-099, 106-149, 153-199, 206-299, 301-399,
R (Ref. Fig. 001A) **ON A/C 401-499,
R R (Ref. Fig. 001B) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
R (Ref. Fig. 004) **ON A/C 401-499,
R R (Ref. Fig. 004A) **ON A/C ALL
There are two CTs for AC auxiliary generation channel:
Current Transformers - Block Diagram
Figure 004
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-23-00Page 21 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1
R Current Transformers - Block Diagram
R Figure 004A
R 1EFF : 401-499, 1 24-23-00 Page 22
1 1 Aug 01/05
1 1
1CES 1
- one CT is built into the APU generator, - one three-hole CT is installed upstream of the generator line contactor.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
(1) Functions
(a) Generator CT The generator CT is used for differential and overcurrent protections.
(b) Three-hole CT The three-hole CT contains three toroidal transformers, one for each of the power feeder cables. The three-hole CT is connected in electrical opposition to the CT of the APU generator. This CT is used for differential and open cable protections.
R **ON A/C 401-499,
R (1) Functions
R R R (a) Generator CT The generator CT is used for differential and overcurrent protections.
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