CN106169740B - 110kV single-trunk segmental wiring incoming relay-protections are latched prepared auto restart relay protecting method - Google Patents

Abstract

The invention discloses a 110kV single busbar segmented wiring incoming line protection locking standby self-injection relay protection method, and provides the control condition of the incoming line protection action locking standby automatic switching No. 1 power circuit breaker closing and the incoming line protection action The control conditions for closing the No. 2 power circuit breaker for blocking standby automatic switching, and the control conditions for closing the closing of the automatic switching section circuit breaker for blocking the incoming line protection action. The present invention can act correctly when various 110kV bus failures occur in various operating modes, and lock the standby automatic switch on and off, preventing the standby automatic switch from being mistakenly switched on to the faulty equipment, which is conducive to the safe and stable operation of the power grid; under various operating modes , when a 110kV outgoing line fault occurs, the automatic switching action of the locking device can be closed without mistake, which improves the reliability of the power supply of the power grid; the logic of the technical solution of the present invention is simple and easy to implement.

Description

110kV single busbar segmented wiring incoming line protection blocking protection method with self-injection relay

technical field

The invention relates to a 110kV single busbar segmented wiring incoming line protection locking standby self-switching relay protection method, which belongs to the technical field of power transmission and distribution network control.

Background technique

Since there is no special 110kV bus differential protection for the 110kV single bus section wiring in the substation, the 110kV incoming line protection is used as the 110kV bus protection to block the 110kV backup power automatic input device (abbreviated as standby self-injection). 110kV incoming line protection and blocking 110kV standby self-injection conventional practice is as follows: Section Ⅰ bus failure is blocked by No. 1 power supply incoming line protection; Line protection action and section protection blocking closing of section circuit breaker. This approach cannot be adapted to the 110kV section I busbar or 110kVII section busbar with outgoing lines, because when the outgoing line fails, the 110kV power supply incoming line protection cannot judge whether it is a 110kV outgoing line failure or a 110kV bus failure. Therefore, the present invention proposes a relay protection technical solution for the 110kV incoming line protection blocking of the substation 110kV single bus segment wiring and automatic switching.

Contents of the invention

The purpose of the present invention is to provide a 110kV single busbar segmented wiring incoming line protection blocking standby self-switching relay protection method, which is applied to the 110kV single busbar segmented primary main wiring system network of a substation, and the main wiring system network has only two power sources The incoming line branch has a power supply, but the outgoing line branch and the transformer branch have no power supply. The present invention can operate correctly when various 110kV bus failures occur in various operating modes, and lock and close the standby automatic switch to prevent the standby automatic switch from being switched on by mistake. On the faulty equipment, when a 110kV outgoing line fault occurs, it can be closed without mistakenly blocking the standby automatic switching action to improve the reliability of the grid power supply.

The purpose of the present invention is achieved through the following technical solutions:

A 110kV single busbar segmented wiring incoming line protection blocking standby automatic switching relay protection method. The control conditions for the incoming line protection action blocking standby automatic switching No. 1 power circuit breaker closing are as follows:

1) There is no blocking signal for the outgoing line protection action on the 110kVI section I bus; the blocking signal conditions for the outgoing line protection action on the 110kVI section I bus are: (1) The section circuit breaker is in the closing position; (2) The outgoing line protection action on the 110kVI section I bus;

2) 110kV Ⅱ section bus complex voltage blocking open;

3) No. 2 power input line protection action;

4) 110kV Ⅱ section bus outlet protection does not operate;

When the above 1)-4) conditions are met, the delay time is t;

5) No. 1 power circuit breaker is in the opening position;

When the above condition 5) is satisfied and the delay time t is up, the No. 1 power circuit breaker of the standby automatic switch is started to close;

The control conditions for the incoming line protection action to be blocked and the No. 2 power supply circuit breaker of the standby automatic switch to be closed are as follows:

1) There is no blocking signal of the outgoing line protection action on the 110kV Ⅱ bus; the conditions for the blocking signal of the outgoing line protection action on the 110kV Ⅱ bus are: (1) the section circuit breaker is in the closing position; (2) the outgoing line protection on the 110kV Ⅱ bus;

2) 110kVI section Ⅰ bus compound voltage blocking open;

3) No. 1 power supply incoming line protection action;

4) 110kVI Section I bus outlet protection does not operate;

When the above 1)-4) conditions are met, the delay time is t;

5) No. 2 power circuit breaker is in the opening position;

When the above condition 5) is satisfied and the delay time t is up, the No. 2 power circuit breaker of the standby automatic switch is started to close;

There are 3 control conditions for the closing of the incoming line protection action blocking standby automatic switching section circuit breaker, which are:

Blocking condition 1:

1) There is no blocking signal of the outgoing line protection action on the 110kVI section Ⅰ bus; the conditions for the blocking signal of the outgoing line protection action on the 110kVI section Ⅰ bus are: (1) the section circuit breaker is in the closing position; (2) the outgoing line protection on the 110kVI section Ⅰ bus is activated;

2) 110kV Ⅱ section bus complex voltage blocking open;

3) No. 2 power input line protection action;

4) 110kV Ⅱ section bus outlet protection does not operate;

When the above 1)-4) conditions are met, the delay time is t;

5) The section circuit breaker is in the opening position;

When the above condition 5) is satisfied and the delay time t is up, start the locking standby automatic switching section circuit breaker to close;

Blocking condition 2:

1) There is no blocking signal of the outgoing line protection action on the 110kV Ⅱ bus; the conditions for the blocking signal of the outgoing line protection action on the 110kV Ⅱ bus are: (1) the section circuit breaker is in the closing position; (2) the outgoing line protection on the 110kV Ⅱ bus;

2) 110kVI section Ⅰ bus compound voltage blocking open;

3) No. 1 power supply incoming line protection action;

4) 110kVI Section I bus outlet protection does not operate;

When the above 1)-4) conditions are met, the delay time is t;

5) The section circuit breaker is in the opening position;

When the above condition 5) is satisfied and the delay time t is up, start the locking standby automatic switching section circuit breaker to close;

Blocking condition 3:

1) Sectional circuit breaker protection action, delay time t;

2) The section circuit breaker is in the opening position;

When the above conditions are met and the delay time t is up, the block circuit breaker of the standby automatic switching section is started to close;

The outgoing line protection on the 110kV Section I bus includes outgoing line branch protection on the 110kV Section I bus, transformer differential protection and backup protection on the transformer 110kV side; the outgoing line protection on the 110kV Section II bus includes outgoing line branch protection on the 110kV Section II bus, transformer differential protection and Backup protection on the 110kV side of the transformer;

The No. 1 power supply incoming line protection and the No. 2 power supply incoming line protection are composed of phase-to-phase distance protection, grounding distance protection, and directional zero-sequence current protection.

The object of the present invention can also be further realized by the following technical measures:

The aforementioned 110kV single busbar segmented wiring incoming line protection locking standby self-switching relay protection method, the No. 1 power incoming line protection and the No. 2 power incoming line protection are composed of phase current protection and directional zero-sequence current protection.

The above-mentioned 110kV single busbar segmented wiring incoming line protection is blocked by self-switching relay protection method, in which the No. 1 power incoming line protection and No. 2 power incoming line protection are set as follows:

1) Phase-to-phase distance protection and grounding distance protection setting value setting:

Phase-to-phase distance protection and grounding distance protection are set according to the minimum measured impedance of the protection when the medium and low-voltage busbars of the largest transformer in the substation or the 110kV outgoing line are short-circuited:

Z _zd ≤K _K Z _L +K _Kb Z _b

In the above formula, K _K and K _Kb are reliability coefficients, generally 0.7-0.8, Z _L is the line impedance; Z _L is 0 when the parameters of the substation are used for calculation; Z _b is the transformer impedance;

2) Directional zero-sequence current setting:

The directional zero-sequence current setting value is set according to the minimum operating mode of the system 110kV bus single-phase grounding fault has a sensitivity setting of ≥ 1.5 times:

In the above formula, is the single-phase short-circuit current of 110kV bus under the minimum operation mode of the system, and K _lm is the sensitivity coefficient, which is generally taken as 1.5.

The above-mentioned 110kV single busbar segmented wiring incoming line protection is blocked by self-switching relay protection method, in which the No. 1 power incoming line protection and No. 2 power incoming line protection are set as follows:

1) The setting value of the phase current protection is set according to the maximum short-circuit current flowing through the protection when the medium and low-voltage bus bars of the largest transformer of the substation or the 110kV outgoing line are short-circuited:

In the above formula, It is the maximum short-circuit current flowing through this protection when the medium and low-voltage buses of the largest transformer of the substation or the 110kV outgoing line are short-circuited under the maximum operating mode of the system. K _k is the reliability coefficient, generally 1.3-1.5;

2) Directional zero-sequence current setting:

The directional zero-sequence current setting value is set according to the minimum operating mode of the system 110kV bus single-phase grounding fault has a sensitivity setting of ≥ 1.5 times:

In the above formula, is the single-phase short-circuit current of 110kV bus under the minimum operation mode of the system, and K _lm is the sensitivity coefficient, which is generally taken as 1.5.

The aforementioned 110kV single busbar segmented wiring incoming line protection locking standby automatic switch relay protection method, in order to prevent the power supply incoming line protection and outgoing line protection actions from competing with each other and cause protection accidental blocking and standby automatic switching action closing, the delay time t is taken as 30 milliseconds .

The aforementioned 110kV single busbar segmented wiring incoming line protection lockout backup self-switching relay protection method, in which the time setting for No. 1 power incoming line protection and No. 2 power incoming line protection is 0.05 seconds.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention can act correctly when various 110kV bus failures occur in various operating modes, and lock the automatic switching on and off of the backup to prevent the automatic switching of the backup from being mistakenly switched to the faulty equipment, which is conducive to the safe and stable operation of the power grid;

2. In various operating modes, when a 110kV outgoing line fault occurs, the present invention can automatically close the lock and automatically turn on the switch, which improves the power supply reliability of the power grid;

3. The logic of the technical solution of the present invention is simple and easy to implement.

Description of drawings

Figure 1 is a main wiring diagram of a single busbar section in a 110kV substation;

Figure 2 is a main wiring diagram of 110kV double busbar (single busbar segment) in 220kV substation;

Figure 3 is a schematic diagram of the 110kV incoming line protection locking standby self-injection.

The symbols in the figure are explained as follows:

- Indicates a logical AND relationship, that is, when all input conditions are met, the output is valid;

- Indicates a logical or relationship, that is, when any of the input conditions is satisfied, the output is valid;

- Indicates the delay time t milliseconds;

- is expressed as the inverse of the input signal.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

This scheme meets the following main wiring requirements:

(1) 110kV single busbar subsection primary main wiring in 110kV substation;

(2) Primary main wiring of 110kV double bus in 220kV substation;

(3) 110kV single busbar section primary main wiring in 220kV substation.

As shown in Fig. 1, the power transmission and distribution network to which the method of the present invention is applied is a substation 110kV single-bus section primary main wiring system network. The primary main wiring of the 110kV system of the power transmission and distribution network includes: No. 1 power supply incoming line interval equipment, No. 2 power supply incoming line interval equipment respectively connected to 110kV Section I busbar and 110kV SectionⅡ busbar; segmental circuit breaker, and is connected in series with segmental current transformers (hereinafter referred to as CT); No. 1 power supply incoming line interval equipment, and No. 110kV bus voltage transformers are connected to the busbar and section busbar, and No. 1 transformer branch, No. 2 transformer branch circuit, No. 1 110kV outlet branch circuit and 110kV voltage transformer (hereinafter referred to as PT) are connected to the 110kV Section I busbar; 110kV II section busbar It is also connected with No. 3 transformer branch, No. 2 110kV outlet branch and 110kV PT. This technical solution can also be used for the main wiring of 110kV double busbars (single busbar section) in 220kV substation as shown in Fig. 2 .

For the above-mentioned 110kV single bus section primary main wiring, since there is no configured 110kV side busbar protection, the power incoming circuit breaker protection is adopted for the 110kV standby automatic switching bus failure blocking scheme. It cannot adapt to the outgoing line, because when the outgoing line fails, the 110kV power supply incoming line protection cannot judge whether the 110kV line is faulty or the 110kV busbar is faulty. It is necessary to propose a new relay protection technology scheme for 110kV incoming line protection blocking standby automatic switching in 110kV substation with single busbar segmented connection to meet the field operation requirements. As shown in Figure 3, it is the principle diagram of 110kV incoming line protection locking standby self-injection, the 110kV single busbar segmented wiring incoming line protection locking standby automatic switching relay protection method of the present invention, the incoming line protection action locking standby automatic switching No. 1 power supply disconnection The control conditions for closing the switch are:

1) There is no blocking signal for the outgoing line protection action on the 110kVI section I bus; the blocking signal conditions for the outgoing line protection action on the 110kVI section I bus are: (1) The section circuit breaker is in the closing position; (2) The outgoing line protection action on the 110kVI section I bus;

2) 110kV Ⅱ section bus complex voltage blocking open;

3) No. 2 power input line protection action;

4) 110kV Ⅱ section bus outlet protection does not operate;

When the above 1)-4) conditions are met, the delay time is t;

5) No. 1 power circuit breaker is in the opening position;

When the above condition 5) is satisfied and the delay time t is up, the No. 1 power circuit breaker of the standby automatic switch is started to close;

The control conditions for the incoming line protection action to be blocked and the No. 2 power supply circuit breaker of the standby automatic switch to be closed are as follows:

1) There is no blocking signal of the outgoing line protection action on the 110kV Ⅱ bus; the conditions for the blocking signal of the outgoing line protection action on the 110kV Ⅱ bus are: (1) the section circuit breaker is in the closing position; (2) the outgoing line protection on the 110kV Ⅱ bus;

2) 110kVI section Ⅰ bus compound voltage blocking open;

3) No. 1 power supply incoming line protection action;

4) 110kVI Section I bus outlet protection does not operate;

When the above 1)-4) conditions are met, the delay time is t;

5) No. 2 power circuit breaker is in the opening position;

When the above condition 5) is satisfied and the delay time t is up, the No. 2 power circuit breaker of the standby automatic switch is started to close;

There are 3 control conditions for the closing of the incoming line protection action blocking standby automatic switching section circuit breaker, which are:

Blocking condition 1:

1) There is no blocking signal of the outgoing line protection action on the 110kVI section Ⅰ bus; the conditions for the blocking signal of the outgoing line protection action on the 110kVI section Ⅰ bus are: (1) the section circuit breaker is in the closing position; (2) the outgoing line protection on the 110kVI section Ⅰ bus is activated;

2) 110kV Ⅱ section bus complex voltage blocking open;

3) No. 2 power input line protection action;

4) 110kV Ⅱ section bus outlet protection does not operate;

When the above 1)-4) conditions are met, the delay time is t;

5) The section circuit breaker is in the opening position;

When the above condition 5) is satisfied and the delay time t is up, start the locking standby automatic switching section circuit breaker to close;

Blocking condition 2:

1) There is no blocking signal of the outgoing line protection action on the 110kV Ⅱ bus; the conditions for the blocking signal of the outgoing line protection action on the 110kV Ⅱ bus are: (1) the section circuit breaker is in the closing position; (2) the outgoing line protection on the 110kV Ⅱ bus;

2) 110kVI section Ⅰ bus compound voltage blocking open;

3) No. 1 power supply incoming line protection action;

4) 110kVI Section I bus outlet protection does not operate;

When the above 1)-4) conditions are met, the delay time is t;

5) The section circuit breaker is in the opening position;

When the above condition 5) is satisfied and the delay time t is up, start the locking standby automatic switching section circuit breaker to close;

Blocking condition 3:

1) Sectional circuit breaker protection action, delay time t;

2) The section circuit breaker is in the opening position;

When the above conditions are met and the delay time t is up, the block circuit breaker of the standby automatic switching section is started to close;

The protection for outgoing lines on the 110kV Section I bus refers to the outgoing line protection on the 110kV Section I bus, the transformer differential protection and the backup protection on the transformer 110kV side; side backup protection;

The No. 1 power supply incoming line protection and No. 2 power supply incoming line protection are composed of phase-to-phase distance protection, grounding distance protection, and directional zero-sequence current protection, or are composed of phase current protection and directional zero-sequence current protection.

The setting values of No. 1 power incoming line protection and No. 2 power incoming line protection are set as follows:

1) Phase-to-phase distance protection and grounding distance protection setting value setting:

Phase-to-phase distance protection and grounding distance protection are set according to the minimum measured impedance of the protection when the medium and low-voltage busbars of the largest transformer in the substation or the 110kV outgoing line are short-circuited:

Z _zd ≤K _K Z _L +K _Kb Z _b

In the above formula, K _K and K _Kb are reliability coefficients, generally 0.7-0.8, Z _L is the line impedance; Z _L is 0 when the parameters of the substation are used for calculation; Z _b is the transformer impedance;

2) Directional zero-sequence current setting:

The directional zero-sequence current setting value is set according to the minimum operating mode of the system 110kV bus single-phase grounding fault has a sensitivity setting of ≥ 1.5 times:

In the above formula, is the single-phase short-circuit current of 110kV bus in the minimum operation mode of the system, and K _lm is the sensitivity coefficient, which is generally taken as 1.5.

3) The setting value of the phase current protection is set according to the maximum short-circuit current flowing through the protection when the medium and low-voltage bus bars of the largest transformer of the substation or the 110kV outgoing line are short-circuited:

In the above formula, It is the maximum short-circuit current flowing through this protection when the medium and low-voltage buses of the largest transformer of the substation or the 110kV outgoing line are short-circuited under the maximum operating mode of the system. K _k is the reliability coefficient, generally 1.3-1.5;

In order to prevent the power incoming line protection and the outgoing line protection action from competing with each other and cause the protection to be closed by mistake, the self-switching action is closed, and the delay time t is 30 milliseconds. The fixed value of the No. 1 power supply incoming line protection and No. 2 power supply incoming line protection time is 0.05 seconds.

Provide the specific embodiment of the inventive method and protection action process and implementation effect below:

No. 1 power circuit breaker and No. 2 power circuit breaker are running, and the section circuit breaker is hot standby

1.1 110kVI section I bus fault

Because the No. 1 power circuit breaker and No. 2 power circuit breaker are running, the sub-section circuit breaker is hot standby, that is, the sub-section circuit breaker is in the opening position. When the 110kVI section Ⅰ bus fails, the No. 1 power supply incoming line protection starts but the 110kVI section Ⅰ bus outlet protection does not start (the 110kVI section Ⅱ bus outlet protection does not reflect the fault and does not start), the 110kVI section Ⅰ bus composite voltage blocking condition is released, after a delay After t time, the block circuit breaker of the self-switching section is started to close.

1.2 110kV Ⅱ section bus failure

Because the No. 1 power circuit breaker and No. 2 power circuit breaker are running, the sub-section circuit breaker is hot standby, that is, the sub-section circuit breaker is in the opening position. When the 110kV Ⅱ section bus fails, the No. 2 power supply protection starts and the 110kV Ⅱ section bus outlet protection does not start (the 110kV Ⅰ section bus outlet protection does not reflect the fault and does not start), the 110kV Ⅱ section bus composite voltage blocking condition is released, after a delay of t time Afterwards, the block circuit breaker of the standby self-transfer section is closed.

1.3 110kV section I bus outgoing line fault

Because the No. 1 power circuit breaker and No. 2 power circuit breaker are running, the sub-section circuit breaker is hot standby, that is, the sub-section circuit breaker is in the opening position. When the outgoing line (or transformer) on the 110kVI section bus is faulty, the outgoing line protection on the 110kVI section bus will act, blocking the closing of the section circuit breaker activated by the 110 standby automatic switching action.

1.4 110kV section Ⅱ bus outgoing line failure

Because the No. 1 power circuit breaker and No. 2 power circuit breaker are running, the sub-section circuit breaker is hot standby, that is, the sub-section circuit breaker is in the opening position. When the outgoing line (or transformer) on the 110kV Ⅱ section bus fails, the outgoing line protection on the 110kV Ⅱ section bus will block the closing of the section circuit breaker activated by the 110 automatic switching operation.

1.5 There is a fault between the section circuit breaker and the section CT

Because the No. 1 power circuit breaker and No. 2 power circuit breaker are running, the sub-section circuit breaker is hot standby, that is, the sub-section circuit breaker is in the opening position. When a fault occurs between the section circuit breaker and the section CT, since the section CT is located on the side of the 110kVI section bus, which is equivalent to a 110kVI section bus failure, the No. 1 power incoming line protection and section circuit breaker protection are both activated; 110kV Ⅰ section bus outlet protection does not activate (110kV Ⅱ section bus outlet protection does not reflect the fault and does not start), the 110kV Ⅰ section bus compound voltage blocking condition is open, or the section circuit breaker protection is blocked after a delay of t time after startup The 110kV standby automatic switching action starts the closing of the section circuit breaker.

2. No. 1 power circuit breaker and section circuit breaker are running, No. 2 power circuit breaker is in hot standby

2.1 110kVI section I bus fault

Because the No. 1 power circuit breaker and section circuit breaker are running, and the No. 2 power circuit breaker is hot standby, that is, the No. 2 power circuit breaker is in the opening position. When the 110kV Ⅰ section bus fails, the No. 1 power supply protection starts and the 110kV Ⅰ section bus outlet protection does not start (the 110kV Ⅱ section bus outlet protection does not reflect the fault and does not start), the 110kVI section Ⅰ bus composite voltage blocking condition is released, after a delay of t time After that, start the locking equipment and switch on the No. 2 power circuit breaker.

2.2 110kV section II bus fault

Because the No. 1 power circuit breaker and section circuit breaker are running, and the No. 2 power circuit breaker is hot standby, that is, the No. 2 power circuit breaker is in the opening position. When the 110kV Ⅱ section bus fails, the No. 1 power supply protection starts and the 110kV Ⅰ section bus outlet protection does not start (the 110kV Ⅱ section bus outlet protection does not reflect the fault and does not start), the 110kV Ⅰ section bus compound voltage blocking condition is released, after a delay of t time After that, start the locking equipment and switch on the No. 2 power circuit breaker.

2.3 110kV section I bus outgoing line fault

Because the No. 1 power circuit breaker and section circuit breaker are running, and the No. 2 power circuit breaker is hot standby, that is, the No. 2 power circuit breaker is in the opening position. When the outgoing line (or transformer) on the 110kV Ⅰ section bus fails, the outgoing line protection on the 110kVI Ⅰ section bus will block the 110kV standby automatic switching action and start the closing of the No. 2 power circuit breaker.

2.4 110kV section Ⅱ bus outgoing line fault

Because the No. 1 power circuit breaker and section circuit breaker are running, and the No. 2 power circuit breaker is hot standby, that is, the No. 2 power circuit breaker is in the opening position. When the outgoing line (or transformer) on the 110kV Ⅱ busbar fails, the 110kV Ⅱ busbar outgoing line protection action and the section circuit breaker is in the closing position, blocking the 110 standby automatic switching action to start the closing of the No. 2 power circuit breaker.

2.5 Fault between section circuit breaker and section CT

Because the No. 1 power circuit breaker and section circuit breaker are running, and the No. 2 power circuit breaker is hot standby, that is, the No. 2 power circuit breaker is in the opening position. When a fault occurs between the section circuit breaker and the section CT, since the section CT is located on the side of the 110kVI section bus, which is equivalent to a 110kVI section bus failure, the No. 1 power incoming line protection and section circuit breaker protection are both activated; 110kV Ⅰ section bus outlet protection does not activate (110kV Ⅱ section bus outlet protection does not reflect the fault and does not start), the 110kV Ⅰ section bus compound voltage blocking condition is open, or the section circuit breaker protection is blocked after a delay of t time after startup 110 The standby automatic switching action starts the closing of the section circuit breaker.

3. The No. 2 power circuit breaker and section circuit breaker are in operation, and the No. 1 power circuit breaker is in hot standby

3.1 110kVI section I bus fault

Because No. 2 power circuit breaker and section circuit breaker are running, No. 1 power circuit breaker is hot standby, that is, No. 1 power circuit breaker is in the opening position. When the 110kV Ⅰ section bus fails, the No. 2 power supply protection starts and the 110kV Ⅱ section bus outlet protection does not start (the 110kV Ⅰ section bus outlet protection does not reflect the fault and does not start), the 110kV Ⅱ bus compound voltage blocking condition is released, after a delay of t After the time, start the blocking equipment and switch on the No. 1 power circuit breaker.

3.2 110kV Ⅱ section bus failure

Because No. 2 power circuit breaker and section circuit breaker are running, No. 1 power circuit breaker is hot standby, that is, No. 1 power circuit breaker is in the opening position. When the 110kV Ⅱ section bus fails, the No. 2 power supply protection starts and the 110kV Ⅱ section bus outgoing line protection, 110kV Ⅰ section bus outgoing line protection does not start, the 110kV Ⅱ section bus compound voltage blocking condition is released, and the blocking is activated after a delay of t. The No. 1 power circuit breaker is closed.

3.3 110kV section I bus outgoing line fault

Because No. 2 power circuit breaker and section circuit breaker are running, No. 1 power circuit breaker is hot standby, that is, No. 1 power circuit breaker is in the opening position. When the outgoing line (or transformer) on the 110kVI section bus is faulty, the outgoing line protection action on the 110kVI section I busbar is at the same time the section circuit breaker is in the closing position, and the 110 standby automatic switch action is blocked to start the closing of the No. 1 power circuit breaker.

3.4 Outgoing Line Fault on 110kV Section II Busbar

Because No. 2 power circuit breaker and section circuit breaker are running, No. 1 power circuit breaker is hot standby, that is, No. 1 power circuit breaker is in the opening position. When the outgoing line (or transformer) on the 110kV Ⅱ section bus fails, the outgoing line protection on the 110kV Ⅱ section bus will block the 110 standby automatic switching action to start the closing of the No. 1 power circuit breaker.

3.5 Fault between section circuit breaker and section CT

Because the No. 1 power circuit breaker and section circuit breaker are running, and the No. 2 power circuit breaker is hot standby, that is, the No. 2 power circuit breaker is in the opening position. When a fault occurs between the section circuit breaker and the section CT, since the section CT is located on the busbar side of the 110kVI section I, which is equivalent to a bus failure in the 110kVI section I, the No. 2 power supply incoming line protection and the section circuit breaker protection are both activated; 110kV II section bus outlet protection does not activate (110kV I section bus outlet protection does not reflect the fault and does not start), 110kV II section bus compound voltage blocking condition is open, or the section circuit breaker protection is blocked after a delay of t time after startup 110 The standby automatic switching action starts the closing of the section circuit breaker.

In addition to the above-mentioned embodiments, the present invention can also have other implementations, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims (4)

1. a kind of 110kV single-trunk segmental wirings incoming relay-protection is latched prepared auto restart relay protecting method, which is characterized in that inlet wire is protected Shield action is latched the control condition that No. 1 power circuit breaker of prepared auto restart closes a floodgate：

1) without the block signal of outlet protection act on I section of busbar of 110kV；Outlet protection act closes on I section of busbar of 110kV Lock signal condition is：(1) section switch is in closing position；(2) outlet protection act on I section of busbar of 110kV；

2) II section of busbar compound voltage lockout of 110kV opens；

3) No. 2 electric power incoming line protection acts；

4) outlet protection is not operating on II section of busbar of 110kV；

Above-mentioned 1) -4) when condition is satisfied by, delay time t；

5) No. 1 power circuit breaker is in open position；

When above-mentioned condition 5) meet and the delay time t times to after, start No. 1 power circuit breaker of locking prepared auto restart and close a floodgate；

Incoming relay-protection action is latched the control condition that No. 2 power circuit breakers of prepared auto restart close a floodgate：

1) there is no outlet protection act block signal on II section of busbar of 110kV；Outlet protection act is latched on II section of busbar of 110kV Signal conditioning is：(1) section switch is in closing position；(2) outlet protection act on II section of busbar of 110kV；

2) I section of busbar compound voltage lockout of 110kV opens；

3) No. 1 electric power incoming line protection act；

4) outlet protection is not operating on I section of busbar of 110kV；

Above-mentioned 1) -4) when condition is satisfied by, delay time t；

5) No. 2 power circuit breakers are in open position；

When above-mentioned condition 5) meet and the delay time t times to after, start No. 2 power circuit breakers of locking prepared auto restart and close a floodgate；

The control condition that incoming relay-protection action locking prepared auto restart section switch closes a floodgate has 3, respectively：

Barring condition 1：

1) there is no outlet protection act block signal on I section of busbar of 110kV；Outlet protection act locking letter on I section of busbar of 110kV Number condition is：(1) section switch is in closing position；(2) outlet protection act on I section of busbar of 110kV；

2) II section of busbar compound voltage lockout of 110kV opens；

3) No. 2 electric power incoming line protection acts；

4) outlet protection is not operating on II section of busbar of 110kV；

Above-mentioned 1) -4) when condition is satisfied by, delay time t；

5) section switch is in open position；

When above-mentioned condition 5) meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；

Barring condition 2：

1) there is no outlet protection act block signal on II section of busbar of 110kV；Outlet protection act is latched on II section of busbar of 110kV Signal conditioning is：(1) section switch is in closing position；(2) outlet protection act on II section of busbar of 110kV；

2) I section of busbar compound voltage lockout of 110kV opens；

3) No. 1 electric power incoming line protection act；

4) outlet protection is not operating on I section of busbar of 110kV；

Above-mentioned 1) -4) when condition is satisfied by, delay time t；

5) section switch is in open position；

When above-mentioned condition 5) meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；

Barring condition 3：

1) section switch protection act, delay time t；

2) section switch is in open position；

When above-mentioned condition meet and the delay time t times to after, start locking prepared auto restart section switch close a floodgate；

On I section of busbar of the 110kV outlet protection include outlet branch protection on I section of busbar of 110kV, transformer differential protection and Transformer 110kV side back-up protections；On II section of busbar of 110kV outlet protection include outlet branch protection on II section of busbar of 110kV, Transformer differential protection and transformer 110kV side back-up protections；

No. 1 electric power incoming line protection, No. 2 electric power incoming line protections is by phase distance protection, ground distance protection, direction zero sequences Current protection is constituted, or is made of phase current protection, direction zero-sequence current protection.

2. 110kV single-trunk segmental wirings incoming relay-protection as described in claim 1 is latched prepared auto restart relay protecting method, special Sign is that No. 1 electric power incoming line protection and No. 2 electric power incoming lines protect fixed value adjusting as follows：

1) phase distance protection, ground distance protection fixed value adjusting：

Phase distance protection, ground distance protection definite value become by electric substation's maximum on this electric substation or 110kV outlet circuits is escaped This protection is minimum in depressor, when low-voltage bus bar short circuit measures impedance setting：

Z_zd≤K_KZ_L+K_KbZ_b

K in above formula_K、K_KbFor safety factor, 0.7-0.8, Z are taken_LFor line impedance；The Z when the parameter for taking this electric substation calculates_L It is 0；Z_bFor transformer impedance；

2) direction zero-sequence current fixed value adjusting：

Direction zero-sequence current definite value is had >=1.5 times of sensitivity by system minimum operational mode 110kV busbar singlephase earth faults It adjusts：

In above formula formula,For 110kV busbares single-phase short circuit current, K under system minimum operational mode_lmFor sensitivity coefficient, take 1.5；

3) phase current protection definite value by escape on this electric substation or 110kV outlet circuits in electric substation's maximum transformer, low pressure it is female The maximum short circuit current that this protection is flowed through when line short circuit is adjusted：

In above formula,For electric substation's maximum transformation in this electric substation under system maximum operational mode or 110kV outlet circuits The maximum short circuit current of this protection, K are flowed through in device, when low-voltage bus bar short circuit_kFor safety factor, 1.3-1.5 is taken.

3. 110kV single-trunk segmental wirings incoming relay-protection as claimed in claim 1 or 2 is latched prepared auto restart relay protecting method, It is characterized in that, the delay time t takes 30 milliseconds.

4. 110kV single-trunk segmental wirings incoming relay-protection as claimed in claim 1 or 2 is latched prepared auto restart relay protecting method, It is characterized in that, the time definite value of No. 1 electric power incoming line protection and the protection of No. 2 electric power incoming lines takes 0.05 second.