TB/T 2843-2007General technical specification for elastic parts for railways (English PDF)

3.7 Automatic inter-station block of axle counting shall meet the following

requirements.

a) The axle counter train detection device completes the inter-section cleared

and occupied state inspection;

b) When the departure station handles the departure route, the inter-station

will automatically switch to the block state;

c) When the train arrives at the reception station or returns back to the

departure station, after confirming that the inter-section is cleared, it shall

automatically terminate the block state;

d) After the inter-section block and before the departure route is unlocked, it

shall not terminate block; after cancelling the departure route and the

departure route is unlocked, the block is automatically terminated

accordingly;

e) When the inter-section axle counter train detection device is reset, after

manually confirming that the inter-section is cleared by both stations,

BREAK the lead seal, AND both stations shall simultaneously operate the

instant reset button within 13 s;

f) The system shall make use of relevant inner-station interlocking conditions

and take other measures to realize the logic judgment function of

distinguishing normal traffic and external interference;

g) The system shall be powered by an uninterruptible power supply, which

shall, after an interruption of the AC power supply, guarantee the time

required by the normal operating train from departure to completely reach

to the reception station.

3.8 The automatic block axis application system shall meet the following

requirements.

a) The system shall have a large section axle counting detection function.

When the block section is in occupied state AND required for reset, it shall

5) The loop current is not less than 600 mA, to ensure reliable reception

of locomotive signals;

6) The loop shall be fixed reliably every 2 m;

7) The loop shall have locomotive signal code sending, code cutting,

disconnection, and short-circuit detection alarming and indication.

3.9 The communication transmission channel shall meet the following

requirements.

a) The inter-station and indoor-outdoor equipment communication

transmission channel of the axle counting system shall adopt the special

transmission line pair (optical cable or symmetrical cable).

b) The axle counting system shall continuously monitor its communication

transmission channel; when this channel has fault, the corresponding axle

track section shall be at occupied state, AND meanwhile indication is

provided.

3.10 It shall equip reliable power supply to ensure the uninterrupted normal

operation of the system.

3.11 The axle counting system shall have a fault alarm function; once fault

occurs, the corresponding axle track section shall be at occupied state, AND

meanwhile indication is provided.

3.12 The axle counting system shall have a standard interface, AND the

information can be included in micro-computer monitoring, computer

interlocking, TDCS (train dispatching command system), and CTC (centralized

traffic control).

3.13 The channels, equipment, power supply, etc., of the axle counting system

shall be configured with lightning protection facilities as specified. As for the

electrification section, the grounding shall be of through grounding line, with the

grounding resistance not more than 1ohm; as for the non-electrified section,

outdoor can adopt distributed grounding mode, with the grounding resistance

not more than 4ohm; under special conditions, it may use through grounding line,

with the grounding resistance not more than 1ohm.

3.14 It shall, at the entrance and exit of the section under the protection of the

axle counter train detection device, respectively install the wheel sensors, which

shall be on the same rail.

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