CN201854081U - Three power backup power automatic input device - Google Patents

Abstract

The utility model discloses an automatic standby power supply switching device for three power supplies, solving the problem that the existing automatic standby power supply switching device is only suitable for a transformer substation with two power lines. A trip position relay TWJ of a breaker 1DL of a main line incoming line passes through a 'nand gate' and then is input by an 'and gate' together with a trip position relay TWJ of a breaker 2DL of a first standby line, a trip position relay TWJ of a breaker 3DL of a second standby line and busbar voltage; and the line voltage eYY2 of the first standby line and the line voltage eYY3 of the second standby line are input into two 'and gates' after dividing into two lines at a 'joint gate'. The automatic standby power supply switching device for three power supplies can distinguish three incoming lines comprehensively, can be suitable for a transformer substation with three incoming lines, and can ensure that one standby power supply is automatically switched into a device to run by corresponding operation when any one incoming line is in failure or overhaul, therefore, the reliability of power supply is improved and the safe and stable operation of a power grid is ensured.

Description

Three power backup power automatic input device

Technical field:

The utility model relates to a safety control device of an electric power system, in particular to an automatic input device for a backup power supply which is suitable for three incoming lines as a power supply of a substation.

Background technique:

The current backup power automatic input device is only suitable for substations with two power lines, one line is used as the main power supply, and the other line is used as the backup power supply. . When the main power supply line, backup power line and circuit breaker are overhauled, or when there is a fault, the main power supply line and backup power come from the same substation transformer and busbar at the upper level. .

In the case of three incoming lines as the substation power supply, even if more than two sets of backup power automatic input devices are installed, it cannot fully meet the needs of on-site operation, which not only increases equipment investment, but also increases the complexity of the secondary circuit. Operation and maintenance costs and difficulties in operation and maintenance have affected the safe and stable operation of the regional power grid, and the reliability of power supply has been greatly reduced.

Invention content:

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a three-power backup power automatic input device, which is suitable for substations with three incoming lines as power sources. Among them, any two incoming lines are used as the main incoming power supply and are mutually backup, one incoming line is defined as the main incoming power supply, the other incoming line is defined as the first standby power supply, and the third incoming line is defined as the second standby power supply. In this way, when any one of the three incoming lines of the substation fails or is overhauled, the corresponding operation can ensure that the backup power supply is automatically put into operation, which improves the reliability of power supply and ensures the safe and stable operation of the power grid.

The technical scheme of the utility model is as follows. The three incoming lines of the substation are respectively the main incoming power line, the first backup power line, and the second backup power line. Each line is connected with a line side switch, a line circuit breaker, and a line bus in sequence Side knife switch; it is characterized in that when the self-injection mode 1 is running, the circuit breaker 1DL trip position relay TWJ of the main incoming line passes through the "NAND gate" and the circuit breaker 2DL trip position relay TWJ of the first backup line, the second backup line The circuit breaker 3DL trip position relay TWJ of the line, the bus voltage input "AND gate", the line voltage eYY2 of the first backup line and the line voltage of the second backup line are divided into two channels and input into two "AND gates" through the "OR gate" of eYY3 ;The first "AND gate" condition is satisfied, after 15 seconds of charging through the "self-injection mode 1 control word", when the second "AND gate" condition is satisfied, after setting the delay Th1, jump the circuit breaker 1DL of the main incoming line, and confirm After the circuit breaker 1DL of the main incoming line has been tripped, judge whether the first backup line voltage eYY2 has voltage after a set time, if the first backup line voltage eYY2 has voltage, close the circuit breaker 2DL of the first backup line, if The first backup line voltage eYY2 has no voltage, and it is connected to the circuit breaker 3DL of the second backup line; when the automatic transfer mode 2 is running, the difference from the automatic transfer mode 1 is that the first backup line is the main incoming line, and the original main incoming line The line acts as the first backup line, and the second backup line remains the second backup line.

It can be seen from the above technical scheme that the utility model has the following beneficial effects: 1. The existing automatic input device for backup power supply can only consider the situation of two incoming lines, and when judging the charging conditions, it is only suitable for judging whether the backup line is under voltage or the backup line is broken. The device is in the position, and the utility model can comprehensively discriminate the three incoming lines. The first backup line or the second backup line has voltage, the first backup line circuit breaker and the second backup line circuit breaker are in position, the action logic adds the first backup line or the second backup line voltage discrimination circuit, the first backup line When there is voltage, the eyy normally open contact of the first backup line is closed, closing the circuit breaker of the first backup line, if the first backup line has no voltage, the eyy normally open contact of the first backup line is opened, and the eyy of the first backup line is normally The closing contact is closed; when the second backup line has voltage, the eyy normally open contact of the second backup line is closed, closing the circuit breaker of the second backup line. 2. The existing backup power automatic input device is only suitable for substations with 2 power sources, so there is only one backup line, and the two backup lines cannot be considered, and the problem of the first backup and the second backup cannot be considered. Once the backup line or the backup line is disconnected A circuit breaker failure will cause a power outage in the substation. And the utility model can adapt to the transformer substation of 3 incoming lines, when the line failure of operation, first consider using the first backup line, then consider using the second backup line, when any one of the first backup line and the second backup line fails, It can operate reliably, ensure the safe operation of the substation, improve the power supply reliability of the substation, ensure the power supply of important users, and completely solve the problem that the self-injection mode cannot be changed flexibly. 3. The design idea of the utility model is clear, the function is perfect, the operation is simple, and various signals are simple and complete, which can meet the needs of the system operation.

Description of drawings:

Figure 1 is a system diagram of a substation.

Fig. 2 is a logical block diagram of the utility model.

In Figure 1, 101 is the main incoming line, 102 is the main incoming line side switch, 103 is the main incoming line circuit breaker, 104 is the main incoming line bus side knife switch, 105 is the first backup line, 106 is The first backup line side switch, 107 is the first backup line circuit breaker, 108 is the first backup line bus side switch, 109 is the second backup line, 110 is the second backup line side switch, 111 is the second backup Line circuit breaker, 112 is the busbar side switch of the first backup line, 113 is the bus tie switch, 114 is the voltage transformer of the main incoming line, 115 is the voltage transformer of the first backup line, 116 is the voltage transformer of the second backup line device, 117 is a bus voltage transformer.

In Figure 2, 1DL-TWJ is the main incoming line circuit breaker trip position relay; 2DL-TWJ is the first backup line circuit breaker trip position relay; 3DL-TWJ is the second backup line circuit breaker trip position relay; eYY1 is the main incoming line circuit breaker trip position relay; The line voltage of the line line, eYY2 is the line voltage of the first backup line, eYY3 is the line voltage of the second backup line, U1 is the bus voltage, and I1 is the main input power line current.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in FIG. 1 , the three incoming lines of the substation are respectively defined as a main incoming power line 101 , a first backup power line 105 , and a second backup power line 109 . The main incoming power line 101 is sequentially connected with the main incoming line voltage transformer 114, the main incoming line side switch 102, the main incoming line circuit breaker 103, the main incoming line busbar side knife switch 104; the first backup power line 105 is sequentially connected with a first backup power line voltage transformer 115, a first backup power line side switch 106, a first backup power line circuit breaker 107, a first backup power line busbar side switch 108; The line 109 is sequentially connected with the line voltage transformer 115 of the second backup power line, the side switch 110 of the second backup power line, the circuit breaker 111 of the second backup power line, and the busbar side switch 112 of the second backup power line.

As shown in Figure 2, when the fixed value of the utility model is operated in zone 1, there are two modes of automatic switching mode 1 (MB ₁ ) and automatic switching mode 2 (MB ₂ ), the logic of which is as follows:

1. Self-injection mode 1: The main input power line 101 is running, and the first backup line 105 and the second backup line 109 are both backup.

1.1 Charging conditions (for 15s):

1> The bus voltage U1 has voltage, the first backup line voltage UX2, and the second backup line voltage UX3 have voltage;

2> The circuit breaker 1DL of the main incoming line is in the close position, the first backup circuit breaker 2DL is in the position, and the second backup circuit breaker 3DL is in the position.

1.2 Discharge conditions:

1> The first backup circuit breaker 2DL or the second backup circuit breaker 3DL is in position,

2> There is a blocking signal input,

3> Hand jump main incoming circuit breaker 1DL,

4> The first backup line voltage Ux2 or the second backup line voltage Ux3 lasts for 15s without voltage,

5> The TWJ of the first backup circuit breaker 2DL or the second backup circuit breaker 3DL is abnormal.

1.3 Action process:

The utility model has been charged, the substation bus U1 has no voltage, the main incoming line current I1 has no current, and the first backup line voltage Ux2 or the second backup line voltage Ux3 has voltage, then the main incoming line circuit breaker is tripped after the setting delay Tt1 1DL. Confirm that the circuit breaker 1DL of the main incoming line is tripped, and if the first backup line voltage Ux2 is under voltage after setting the delay Th1, then close the first backup line circuit breaker 2DL; if the first backup line voltage Ux2 has no voltage, the second backup line When the line voltage Ux3 is under pressure, the second backup circuit breaker 3DL is closed.

2. Self-injection mode 2: The first backup line is running, the main incoming line and the second backup line are used as backup.

2.1 Charging conditions (continuous 15S):

1> The bus voltage U1 is under voltage, the main incoming line voltage Ux1 or the second backup line voltage Ux3 is under voltage,

2> The first backup circuit breaker 2DL is in the closed position, the main incoming line circuit breaker 1DL is in the position, and the second backup circuit breaker 3DL is in the position.

2.2 Discharge conditions:

1> The circuit breaker 1DL of the main incoming line or the circuit breaker 3DL of the second backup circuit is in the closed position,

2> There is a blocking signal input,

3>Hand jump first backup circuit breaker 2DL,

4> The main incoming line voltage Ux1 and the second backup line voltage Ux3 last 15s without voltage,

5> The tripping position TWJ of the main incoming circuit breaker 1DL or the second backup circuit breaker 3DL is abnormal,

2.3 Action process:

The utility model has been charged, the substation bus U1 has no voltage, and the first backup line current I2 has no current at the same time, check the voltage Ux1 of the main incoming line or check the voltage Ux3 of the second backup line, then jump to the first backup after setting the delay time Tt2 Line breaker 2DL. Confirm that the first backup line circuit breaker 2DL is tripped, and if the main incoming line voltage Ux1 is under voltage after setting the delay Th2, close the main incoming line circuit breaker 1DL; if the main incoming line voltage Ux1 has no voltage, the second backup line When the line voltage Ux3 is under pressure, the second backup circuit breaker 3DL is closed.

When the circuit breaker of the first backup line is overhauled, the circuit breaker maintenance pressure plate of the first backup line is put into operation, and the fixed value switching operates in zone 2, and only the automatic switching mode 1 is used. At this time, the position of the circuit breaker TWJ and the line voltage of the first backup line are no longer judged. The utility model has been charged, the substation bus U1 has no voltage, the main incoming line current I1 has no current, and the second backup line voltage Ux3 has voltage, then After setting the time delay Tt1, jump the circuit breaker 1DL of the main incoming line. Confirm that the circuit breaker 1DL of the main incoming line is tripped, and close the circuit breaker 3DL of the second backup circuit.

When the circuit breaker of the main incoming line is overhauled, the circuit breaker inspection pressure plate of the main incoming line is put into operation, and the fixed value switching operates in zone 3, and only the automatic switching mode 2 is used. At this time, the position of the circuit breaker TWJ and the line voltage of the main incoming line are no longer judged. The utility model has been charged, the substation bus U1 has no voltage, the first backup line current I1 has no current, and the second backup line voltage Ux3 has pressure, then the The time delay Tt1 is set to trip the first backup circuit breaker 1DL. Confirm that the first backup circuit breaker 1DL is tripped, and close the second backup circuit breaker 3DL.

When the circuit breaker of the second backup line is overhauled, the circuit breaker maintenance pressure plate of the second backup line is put into operation, and the fixed value switching operates in zone 4, with automatic switching mode 1 and automatic switching mode 2. At this time, the position of the circuit breaker TWJ and the line voltage of the second backup line are no longer judged, which is equivalent to a conventional backup power automatic input device.

When the utility model was operated by the self-injection mode 1, the main incoming line, the first standby line, and the second standby line were operated. The 1DL trip position relay TWJ of the main incoming line circuit breaker passes through the "NAND gate", and the first backup circuit breaker 2DL trip position relay TWJ, the second backup circuit breaker 3DL trip position relay TWJ, the bus voltage input "AND gate" , the line voltage eYY2 of the first backup line and the line voltage eYY3 of the second backup line are input into two "AND gates" in two ways through the "OR gate". The "AND gate" also has the main incoming line current I1 and the bus voltage U1.

Charging circuit: when the self-injection mode 1 control word is input, the charging is completed after 15 seconds, the first standby line voltage eYY2 or the second standby line voltage eYY3 has voltage, the main incoming line current I1 of the running line has no current, and the bus voltage U1 has no voltage , the "AND gate" output jumps the circuit breaker 103 of the main incoming line through the set time Th1, after confirming that the circuit breaker 103 of the main incoming line has tripped, after the set time, judge whether the first standby line voltage eYY2 has voltage, as If the first backup line voltage eYY2 has voltage, it is connected to the circuit breaker 107 of the first backup line, and if the first backup line voltage eYY2 has no voltage, it is connected to the circuit breaker 111 of the second backup line.

Discharge circuit: the first backup line voltage eYY2 or the second backup line voltage eYY3 has no voltage, after 15 seconds, the circuit breaker 103 of the running main incoming line, the circuit breaker 103 of the running main incoming line or the first backup The circuit breaker tripping position TWJ of the line is abnormal, the circuit breaker 2DL of the first backup line or the circuit breaker 3DL of the second backup line is in the closing position, the locking mode 1 has opening and closing, and the automatic input device of the three-power backup power supply operates 5 seconds after tripping The circuit breaker trip position TWJ of the main incoming line without operation, any one of the above has an input, and it is discharged through the "OR gate" output.

When the utility model operates according to the self-injection mode 2, the difference from the self-injection mode 1 is that the first backup line is the main incoming line, the original main incoming line is used as the first backup line, and the second backup line is still the second The backup line, the others are the same.

Claims (1)

1. power backup power supply automatic throw-in equipment, be applicable to the transformer station of three inlet wires as power supply, three inlet wires of transformer station are respectively the master and advance power circuit, the first stand-by power supply circuit, the second stand-by power supply circuit, and every circuit is connected with line side disconnecting link, line-breaker, circuit bus bar side disconnecting link in turn; Circuit breaker 1DL (103) the tripping position relay TWJ that it is characterized in that main inlet wire circuit imports " with door " with circuit breaker 2DL (107) tripping position relay TWJ, circuit breaker 3DL (111) the tripping position relay TWJ of second extension wire, the busbar voltage of first extension wire behind non-conjunction, the line voltage distribution eYY2 of first extension wire and the line voltage distribution of second extension wire divide the two-way input two " with door " through the eYY3 disjunction gate.