table of Contents
2 The main technical indicators of 25HZ phase sensitive track circuit are as follows
6 Pay attention to the following points when adjusting the 25Hz phase sensitive track circuit
0 Preface
The 25HZ phase sensitive track circuit has the following four forms: old type (JRJC-66/345), 97 type (JRJC-70/240), WXJ-25 type (microelectronic phase sensitive receiver type), adapter type,
Indoor relays use JRJC-66/345, JRJC-70/240, and microelectronic phase-sensitive receivers. The adapter type is matched with JRJC-70/240 and microelectronic phase-sensitive receivers.
1 Relay standard
|
|
Orbit lags local voltage phase (degrees) |
Residual pressure |
| JRJC-66/345 |
90+8 |
7V |
| JRJC-70/240 |
87+8 |
7.4V |
| Microelectronic phase sensitive receiver |
90 |
10 |
In the project opening, first of all, it is necessary to ensure that the indoor relay receiving phase is within the above range. If the test phase does not meet the standard, it can be adjusted by changing the HF-25 protective box or the adapter tap method. If it still fails to meet the requirements after adjustment, you need to The rail voltage is adjusted to meet the working requirements of the relay.
2 The main technical indicators of 25HZ phase sensitive track circuit are as follows
| 25HZ |
Local 110V |
Old model |
110V±5.5V |
|
|
| Type 97 |
110V ± 3.3V |
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| Relay |
Turnout section |
18～25V |
①The effective voltage is: actual measured voltage×cosβ |
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| Strand road and no fork section greater than 800m |
18～30V |
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| Relay residual voltage |
Old model |
≤7V |
0.06Ω standard sub-route for residual pressure test |
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| Type 97 |
≤7.4V |
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| Electronic receiver |
≤10V |
- (1) According to Article 4.3.2 of "Maintenance Regulations (Technical Standards)": "When adjusting the state, the effective voltage on the track coil (receiving end of the electronic receiver track) of the track relay should not be less than 18V."
- (2) The definition of effective voltage: UY=U×cosβ.
- Among them, Uy—effective voltage; U—measured terminal voltage; β—offset angle (offset angle β is the difference between the phase difference between the rail voltage and the local voltage and the 90-degree angle).
- According to the above conditions, the minimum adjustment value of each section terminal voltage is: Umin=18/cosβ.
- (3) In order to ensure the reliable operation of the track circuit under various conditions, the adjustment should generally be mastered as follows:
- Turnout section and throat-free section: U= Umin+(3-7)V, and between 18V-25V; stranded road or section with turnout greater than 800m (no fork): U= Umin+(5-9)V , And between 18V-30V; in the one sending and receiving section, the voltage deviation of each receiving voltage is not more than 3V.
3 Regulations for outdoor resistance and power-receiving end transformation ratio of 25HZ phase track circuit
The above is the resistance and transformation ratio requirements of 97 type and microelectronic receiver type. If it is the old type (JRJC-66/345), please refer to the corresponding regulations in section 4.3 of the "Maintenance Regulations". The adjustment of the coded section of the main line is carried out in accordance with the drawings and design requirements.
|
|
Power transmission Resistance Ω |
Use of power transformer |
|||
| Ⅰ secondary side use |
Ⅰ secondary side connection |
Secondary side use |
Secondary side connection |
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| Choke track section |
4．4 |
I1 、 I4 |
I2-I3 |
Ⅲ1、Ⅲ3 |
no |
| No choke, one get one receive |
0.9 |
I1 、 I4 |
I2-I3 |
Ⅱ3、Ⅲ1 |
Ⅱ4－Ⅲ2 |
| No choke, one send and receive more |
1.6 |
I1 、 I4 |
I2-I3 |
Ⅱ3、Ⅲ1 |
Ⅱ4－Ⅲ2 |
4 When adjusting the 25Hz track voltage, the resistance value of the current-limiting resistance at the transmitting end and the transformer transformation ratio at the receiving end must not be changed at will, and the phase of the track circuit must be kept correct. In the one-transmitting-multiple-receiving section, attention should also be paid to the voltage balance of each receiving terminal.
5. After adjusting the rail voltage, especially after the boost adjustment, the shunt sensitivity test must be carried out.
- ⑴ When using the 0.06Ω standard branch circuit branch test, the residual voltage of the old track relay is not greater than 7V, the residual voltage of the 97 type track relay is not greater than 7.4V, and the front contact of the track relay should be disconnected.
- ⑵ When using the 0.06Ω standard branch circuit for branch test, the voltage at the receiving end of the electronic receiver track is not greater than 10V, and the voltage at the output end is 0V, and the executive relay should fall reliably.
6 Pay attention to the following points when adjusting the 25Hz phase sensitive track circuit
(1) The value of the current-limiting resistance at the transmitting end and the transformation ratio of the relay transformer at the receiving end should be fixed according to the requirements of the schematic diagram, and should not be adjusted as a means of adjusting the track circuit. If the current-limiting resistance is reduced, the shunt of the track circuit will be deteriorated. If the transformation ratio of the relay transformer is changed, the impedance matching condition of the equipment connected to the power receiving terminal and the impedance of the track circuit will be destroyed. Therefore, before adjustment, first check whether the resistance value of the current-limiting resistor at the transmitting end and the transformation ratio of the relay transformer at the receiving end meet the requirements of the schematic diagram. Then adjust the secondary voltage of the power supply transformer to meet the working requirements of the track circuit. (Note: Due to the design of the code-sending circuit, some track circuits have fixed outdoor transmission and reception transformation ratios, and cannot be adjusted. Only the indoor transmission transformer can be adjusted)
(2) One of the important features of the 25Hz phase-sensitive track circuit is its phase selectivity, so it has reliable rail end insulation damage protection. Before adjusting the track circuit, check whether the components are connected according to the same name and whether the connection of the rail meets the phase requirements. When adjusting the voltage of the power supply transformer, you should also be careful not to connect the terminals with the same name incorrectly.
(3) For the one-transmit-one-receive track circuit without an empty choke transformer and no power receiving branch, in the case of the highest ballast resistance, use a standard sub-route (resistance value of 0.06) at the power transmitting end and the power receiving end When branching, there should be branch inspection; for track circuits with one transmission and multiple reception, the most unfavorable location of the branch is different depending on the switch layout. Therefore, the branch inspection should be carried out at the transmission end and all the power receiving ends. In addition, it is necessary to check the branch at the fork tip and other places; if there is an unpowered branch, it should also be checked at the end of the unpowered branch. The one-sending-multiple-receiving track circuit connects the front contacts of all the power-receiving end track relays in series and then controls the track repeating relay, and uses its contacts in the signal circuits. Therefore, it is only necessary to ensure that one receiving terminal meets the requirements for branch inspection.
(4) The track circuit with an empty choke transformer should be compensated for its track circuit. When the track circuit with the empty choke transformer is coded, in addition to the track circuit compensation, the coded information of the locomotive signal should also be compensated. The type of compensator required due to different locomotive signal information is also different. The corresponding type of compensator should be selected according to the locomotive signal information. After determining the compensator, adjust the power supply voltage of the track circuit as needed.
(5) In the case of one transmission and multiple reception, the resistance of the receiving end of the track circuit should also be fixed according to the given value in the adjustment reference table. Then, adjust the power supply voltage of the track circuit according to its type according to the corresponding type in the adjustment reference table. At this time, the terminal voltage on each track relay should be within the allowable voltage range given in the adjustment reference table.