CN218867906U - Voltage switching relay PT voltage loss signal loop - Google Patents

Abstract

The utility model belongs to the technical field of transformer substation voltage switching, in particular to a voltage switching relay PT voltage loss signal loop; the system comprises a voltage switching relay power supply loop and a PT voltage loss signal loop, wherein the voltage switching relay power supply loop comprises a first bus loop and a second bus loop, a normally open contact of a master knife switch auxiliary switch I, a first relay and a second relay are arranged on the first bus loop, and a normally open contact of a master knife switch auxiliary switch II, a third relay and a fourth relay are arranged on the second bus loop; the PT voltage-loss signal circuit comprises a first voltage-loss signal circuit and a second voltage-loss signal circuit, wherein a first normally closed contact and a first normally closed contact are arranged on the first voltage-loss signal circuit, and an A-phase breaker normally open contact, a B-phase breaker normally open contact and a C-phase breaker normally open contact are arranged on the second voltage-loss signal circuit; the utility model discloses under the circumstances such as the maintenance has a power failure, voltage switching device can't report PT decompression signal, reduces the interference to the operation personnel.

Description

A voltage switching relay PT voltage loss signal circuit

technical field

The utility model belongs to the technical field of substation voltage switching, in particular to a PT voltage loss signal circuit of a voltage switching relay.

Background technique

When the main wiring of the substation is double-bus wiring, the corresponding substation internal interval can run on different buses, and the voltage taken by the protection device, measurement and control device, etc. should be the voltage on the corresponding bus. Therefore, a voltage switching device is required for voltage switching; When due to some reason, such as poor contact of the knife switch auxiliary switch, etc., the voltage switching relay is completely demagnetized, and its moving contact will be closed, and the PT loss of voltage signal will be reported at this time; When the knife switch is disconnected, the PT loss of voltage signal is still reported due to the disconnection of the knife switch, which interferes with the operating personnel; Interference, to reduce the workload of the manual reset signal voltage switch relay PT loss of voltage signal circuit is very necessary.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the prior art, and provide a PT loss-of-voltage signal that cannot be reported by the voltage switching device in the case of power outage maintenance, etc., so as to reduce the interference to operating personnel and reduce the workload of manual reset signals. Voltage switching relay PT loss of voltage signal circuit.

The purpose of this utility model is achieved in this way: a voltage switching relay PT loss of voltage signal circuit, which includes a voltage switching relay power circuit and a PT loss of voltage signal circuit, the voltage switching relay power circuit includes a first bus circuit and a second Two busbar loops, the first busbar loop and the second busbar loop are connected in parallel, the first busbar loop is provided with a normally open contact of an I-bus knife switch auxiliary switch, a first relay and a second relay, the The second bus circuit is provided with II female knife switch auxiliary switch normally open contacts, a third relay and a fourth relay; the PT loss of voltage signal circuit includes a first loss of pressure signal circuit and a second loss of pressure signal circuit, the The first loss-of-voltage signal loop is connected in series with the second loss-of-voltage signal loop, and a first normally-closed contact and a second normally-closed contact are arranged on the first loss-of-voltage signal loop, and the second loss-of-voltage signal loop The circuit is provided with a normally open contact of the phase A circuit breaker, a normally open contact of the B phase circuit breaker and a normally open contact of the C phase circuit breaker, and the first relay and the second relay are connected to the first normally closed contact. The second normally closed contact is controlled by the third relay and the fourth relay.

The voltage switching relay power supply circuit further includes a first parallel circuit and a second parallel circuit, and the first bus circuit and the second bus circuit are connected in parallel through the first parallel circuit and the second parallel circuit.

The end of the first parallel circuit is provided with a first power terminal, the end of the first bus circuit is provided with a second power terminal, and the end of the first parallel circuit is connected to the power supply through the first power terminal. The end of the first bus circuit is connected to the power supply through the second power supply terminal.

A first intermediate terminal is provided in the middle of the first bus circuit, and a second intermediate terminal is provided in the middle of the second bus circuit.

The end of the first pressure loss signal circuit is provided with a first signal circuit terminal, the end of the second pressure loss signal circuit is provided with a second signal circuit terminal, and the PT loss of pressure signal circuit passes through the first The signal loop terminal and the second signal loop terminal are connected to other loops.

The first loss-of-voltage signal loop is connected to the second loss-of-voltage signal loop through a third intermediate terminal.

Beneficial effects of the utility model: a voltage switching relay PT loss of voltage signal loop of the utility model is composed of a voltage switching relay power supply loop and a PT loss of voltage signal loop, and the voltage switching relay power supply loop is normally opened by a female knife switch auxiliary switch. Point 10, Ⅱ mother knife switch auxiliary switch normally open contact 3, voltage switching relay 13, 12, 5, 6; The open contact 15, the normally open contact 16 of the phase B circuit breaker, and the normally open contact 17 of the phase C circuit breaker are connected in series;

When a certain interval normally operates on the busbar I, the normally open contact 10 of the auxiliary switch of the I busbar switch is closed, and the relays 13 and 12 act. At this time, the normally closed contact 21 is a dynamic break contact, and the normally closed contact 21 disconnected, the voltage switching device cannot report the PT loss of voltage signal; when the normally open contact 10 of the I female knife switch auxiliary switch is in poor contact, the relays 13 and 12 lose their magnetism and cannot act, and the normally closed contact 21 is closed; Running on the I busbar, the normally open contact 3 of the II bus knife switch auxiliary switch is disconnected, the relays 5 and 6 are demagnetized, unable to act, and the normally closed contact 22 is closed; since it is in normal operation at this time, the A-phase circuit breaker is normally The open contact 15, the normally open contact 16 of the phase B circuit breaker, and the normally open contact 17 of the phase C circuit breaker are all in the closed state, therefore, the PT loss of voltage signal circuit is turned on, and the PT loss of voltage signal is reported;

When a certain interval normally operates on the busbar II, the normally open contact 3 of the auxiliary switch of the II busbar switch is closed, and the relays 5 and 6 act. disconnected, the voltage switching device cannot report the PT loss of voltage signal; when the normally open contact 3 of the auxiliary switch of the Ⅱ mother knife switch is in poor contact, the relays 5 and 6 lose their magnetism and cannot act, and the normally closed contact 22 is closed; Running on the busbar II, the normally open contact 10 of the auxiliary switch of the I mother knife switch is disconnected, the relays 13 and 12 are demagnetized, unable to act, and the normally closed contact 21 is closed; since it is in normal operation at this time, the A-phase circuit breaker is normally The open contact 15, the normally open contact 16 of the phase B circuit breaker, and the normally open contact 17 of the phase C circuit breaker are all in the closed state, therefore, the PT loss of voltage signal circuit is conducted, and the PT loss of voltage signal is reported.

When a certain bay is powered off for maintenance, the bay circuit breaker and knife switch are both disconnected at this time; the normally open contact 10 of the auxiliary switch of the female knife switch and the normally open contact 3 of the auxiliary switch of the female knife switch are all disconnected , the relays 13, 12 and 5, 6 lose their magnetism and cannot act, the normally closed contact 21 and the normally closed contact 22 are closed; since the interval circuit breaker is disconnected at this time, the normally open contact 15 of the A phase circuit breaker and the B phase The normally open contact 16 of the circuit breaker and the DLC normally open contact of the C-phase circuit breaker are all in the disconnected state, the PT loss of voltage signal circuit cannot be conducted, and the PT loss of voltage signal cannot be reported; a voltage switching relay of the utility model PT loss Voltage signal circuit, in the case of power outage maintenance, etc., the voltage switching device cannot report the PT loss of voltage signal, which reduces the interference to the operating personnel and reduces the workload of manual reset signals.

Description of drawings

Figure 1 is a schematic structural diagram of a voltage switching relay power supply circuit.

FIG. 2 is a structural schematic diagram of a PT pressure loss signal circuit.

Detailed ways

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

Example

As shown in Figure 1-2, a voltage switching relay PT loss of voltage signal circuit, which includes a voltage switching relay power circuit and a PT loss of voltage signal circuit, the voltage switching relay power circuit includes a first bus circuit 9 and a second A bus circuit 2, the first bus circuit 9 and the second bus circuit 2 are connected in parallel, and the first bus circuit 9 is provided with a normally open contact 10 of an auxiliary switch of the I bus switch, a first relay 13 and a second Two relays 12, the second bus circuit 2 is provided with the normally open contact 3 of the auxiliary switch of the II mother knife switch, the third relay 5 and the fourth relay 6; the PT loss of voltage signal circuit includes the first loss of pressure signal circuit 20 and the second loss of pressure signal circuit 23, the first loss of pressure signal circuit 20 and the second loss of pressure signal circuit 23 are connected in series, the first loss of pressure signal circuit 20 is provided with a first normally closed contact 21 and the second normally closed contact 22, the second loss of voltage signal circuit 23 is provided with A phase circuit breaker normally open contact 15, B phase circuit breaker normally open contact 16 and C phase circuit breaker normally open contact 17, the first relay 13 and the second relay 12 control the first normally closed contact 21, the third relay 5 and the fourth relay 6 control the second normally closed contact 22 control.

A voltage switching relay PT loss of voltage signal circuit of the utility model is composed of a voltage switching relay power supply circuit and a PT loss of pressure signal circuit. Auxiliary switch normally open contact 3, voltage switching relay 13, 12, 5, 6; PT loss of voltage signal circuit consists of normally closed contact 21, normally closed contact 22, A phase circuit breaker normally open contact 15, B phase A circuit breaker normally open contact 16 and a phase C circuit breaker normally open contact 17 are connected in series;

When a certain interval normally operates on the busbar I, the normally open contact 10 of the auxiliary switch of the I busbar switch is closed, and the relays 13 and 12 act. At this time, the normally closed contact 21 is a dynamic break contact, and the normally closed contact 21 disconnected, the voltage switching device cannot report the PT loss of voltage signal; when the normally open contact 10 of the I female knife switch auxiliary switch is in poor contact, the relays 13 and 12 lose their magnetism and cannot act, and the normally closed contact 21 is closed; Running on the I busbar, the normally open contact 3 of the II bus knife switch auxiliary switch is disconnected, the relays 5 and 6 are demagnetized, unable to act, and the normally closed contact 22 is closed; since it is in normal operation at this time, the A-phase circuit breaker is normally The open contact 15, the normally open contact 16 of the phase B circuit breaker, and the normally open contact 17 of the phase C circuit breaker are all in the closed state, therefore, the PT loss of voltage signal circuit is turned on, and the PT loss of voltage signal is reported;

When a certain interval normally operates on the busbar II, the normally open contact 3 of the auxiliary switch of the II busbar switch is closed, and the relays 5 and 6 act. disconnected, the voltage switching device cannot report the PT loss of voltage signal; when the normally open contact 3 of the auxiliary switch of the Ⅱ mother knife switch is in poor contact, the relays 5 and 6 lose their magnetism and cannot act, and the normally closed contact 22 is closed; Running on the busbar II, the normally open contact 10 of the auxiliary switch of the I mother knife switch is disconnected, the relays 13 and 12 are demagnetized, unable to act, and the normally closed contact 21 is closed; since it is in normal operation at this time, the A-phase circuit breaker is normally The open contact 15, the normally open contact 16 of the phase B circuit breaker, and the normally open contact 17 of the phase C circuit breaker are all in the closed state, therefore, the PT loss of voltage signal circuit is conducted, and the PT loss of voltage signal is reported.

When a certain bay is powered off for maintenance, the bay circuit breaker and knife switch are both disconnected at this time; the normally open contact 10 of the auxiliary switch of the female knife switch and the normally open contact 3 of the auxiliary switch of the female knife switch are all disconnected , the relays 13, 12 and 5, 6 lose their magnetism and cannot act, the normally closed contact 21 and the normally closed contact 22 are closed; since the interval circuit breaker is disconnected at this time, the normally open contact 15 of the A phase circuit breaker and the B phase The normally open contact 16 of the circuit breaker and the DLC normally open contact of the C-phase circuit breaker are all in the disconnected state, the PT loss of voltage signal circuit cannot be conducted, and the PT loss of voltage signal cannot be reported; a voltage switching relay of the utility model PT loss Voltage signal circuit, in the case of power outage maintenance, etc., the voltage switching device cannot report the PT loss of voltage signal, which reduces the interference to the operating personnel and reduces the workload of manual reset signals.

Example

As shown in Figure 1-2, a voltage switching relay PT loss of voltage signal circuit, which includes a voltage switching relay power circuit and a PT loss of voltage signal circuit, the voltage switching relay power circuit includes a first bus circuit 9 and a second A bus circuit 2, the first bus circuit 9 and the second bus circuit 2 are connected in parallel, and the first bus circuit 9 is provided with a normally open contact 10 of an auxiliary switch of the I bus switch, a first relay 13 and a second Two relays 12, the second bus circuit 2 is provided with the normally open contact 3 of the auxiliary switch of the II mother knife switch, the third relay 5 and the fourth relay 6; the PT loss of voltage signal circuit includes the first loss of pressure signal circuit 20 and the second loss of pressure signal circuit 23, the first loss of pressure signal circuit 20 and the second loss of pressure signal circuit 23 are connected in series, the first loss of pressure signal circuit 20 is provided with a first normally closed contact 21 and the second normally closed contact 22, the second loss of voltage signal circuit 23 is provided with A phase circuit breaker normally open contact 15, B phase circuit breaker normally open contact 16 and C phase circuit breaker normally open contact 17, the first relay 13 and the second relay 12 control the first normally closed contact 21, the third relay 5 and the fourth relay 6 control the second normally closed contact 22 control.

For better effect, the voltage switching relay power circuit also includes a first parallel circuit 1 and a second parallel circuit 7, and the first bus circuit 9 and the second bus circuit 2 pass through the first parallel circuit 1 and the second parallel circuit 7 are connected in parallel, and the structure is simple and reasonable.

For a better effect, the end of the first parallel circuit 1 is provided with a first power terminal 8, the end of the first bus circuit 9 is provided with a second power terminal 14, and the end of the first parallel circuit 1 is provided with a second power terminal 14. The end is connected to the power supply through the first power supply terminal 8, and the end of the first bus circuit 9 is connected to the power supply through the second power supply terminal 14. Each terminal can facilitate the connection of each circuit to the power supply.

For better effect, the middle part of the first bus circuit 9 is provided with a first intermediate terminal 11, and the middle part of the second bus circuit 2 is provided with a second intermediate terminal 4, which can be connected with other equipment through the intermediate terminal, Improve loop scalability.

For a better effect, the end of the first voltage loss signal circuit 20 is provided with a first signal circuit terminal 19, and the end of the second voltage loss signal circuit 23 is provided with a second signal circuit terminal 18. The PT loss of voltage signal circuit is connected with other circuits through the first signal circuit terminal 19 and the second signal circuit terminal 18, and the connection with other circuits can be facilitated through each terminal.

For better effect, the first loss of voltage signal circuit 20 and the second loss of voltage signal circuit 23 are connected through the third intermediate terminal 24 to facilitate the connection between the circuits.

A voltage switching relay PT loss of voltage signal circuit of the utility model is composed of a voltage switching relay power supply circuit and a PT loss of pressure signal circuit. Auxiliary switch normally open contact 3, voltage switching relay 13, 12, 5, 6; PT loss of voltage signal circuit consists of normally closed contact 21, normally closed contact 22, A phase circuit breaker normally open contact 15, B phase A circuit breaker normally open contact 16 and a phase C circuit breaker normally open contact 17 are connected in series;

When a certain interval normally operates on the busbar I, the normally open contact 10 of the auxiliary switch of the I busbar switch is closed, and the relays 13 and 12 act. At this time, the normally closed contact 21 is a dynamic break contact, and the normally closed contact 21 disconnected, the voltage switching device cannot report the PT loss of voltage signal; when the normally open contact 10 of the I female knife switch auxiliary switch is in poor contact, the relays 13 and 12 lose their magnetism and cannot act, and the normally closed contact 21 is closed; Running on the I busbar, the normally open contact 3 of the II bus knife switch auxiliary switch is disconnected, the relays 5 and 6 are demagnetized, unable to act, and the normally closed contact 22 is closed; since it is in normal operation at this time, the A-phase circuit breaker is normally The open contact 15, the normally open contact 16 of the phase B circuit breaker, and the normally open contact 17 of the phase C circuit breaker are all in the closed state, therefore, the PT loss of voltage signal circuit is turned on, and the PT loss of voltage signal is reported;

When a certain interval normally operates on the busbar II, the normally open contact 3 of the auxiliary switch of the II busbar switch is closed, and the relays 5 and 6 act. disconnected, the voltage switching device cannot report the PT loss of voltage signal; when the normally open contact 3 of the auxiliary switch of the Ⅱ mother knife switch is in poor contact, the relays 5 and 6 lose their magnetism and cannot act, and the normally closed contact 22 is closed; Running on the busbar II, the normally open contact 10 of the auxiliary switch of the I mother knife switch is disconnected, the relays 13 and 12 are demagnetized, unable to act, and the normally closed contact 21 is closed; since it is in normal operation at this time, the A-phase circuit breaker is normally The open contact 15, the normally open contact 16 of the phase B circuit breaker, and the normally open contact 17 of the phase C circuit breaker are all in the closed state, therefore, the PT loss of voltage signal circuit is conducted, and the PT loss of voltage signal is reported.

When a certain bay is powered off for maintenance, the bay circuit breaker and knife switch are both disconnected at this time; the normally open contact 10 of the auxiliary switch of the female knife switch and the normally open contact 3 of the auxiliary switch of the female knife switch are all disconnected , the relays 13, 12 and 5, 6 lose their magnetism and cannot act, the normally closed contact 21 and the normally closed contact 22 are closed; since the interval circuit breaker is disconnected at this time, the normally open contact 15 of the A phase circuit breaker and the B phase The normally open contact 16 of the circuit breaker and the DLC normally open contact of the C-phase circuit breaker are all in the disconnected state, the PT loss of voltage signal circuit cannot be conducted, and the PT loss of voltage signal cannot be reported; a voltage switching relay of the utility model PT loss Voltage signal circuit, in the case of power outage maintenance, etc., the voltage switching device cannot report the PT loss of voltage signal, which reduces the interference to the operating personnel and reduces the workload of manual reset signals.

Claims (6)

1. A voltage switching relay PT loss of voltage signal circuit, which includes a voltage switching relay power circuit and a PT loss of voltage signal circuit, characterized in that: the voltage switching relay power circuit includes a first bus circuit (9) and a second The bus circuit (2), the first bus circuit (9) and the second bus circuit (2) are connected in parallel, and the first bus circuit (9) is provided with a normally open contact of an auxiliary switch of the I mother knife switch (10), the first relay (13) and the second relay (12), the second bus circuit (2) is provided with II mother knife switch auxiliary switch normally open contact (3), the third relay (5) and the fourth relay (6); the PT loss-of-pressure signal loop includes a first loss-of-pressure signal loop (20) and a second loss-of-pressure signal loop (23), and the first loss-of-pressure signal loop (20) and the The second loss of voltage signal circuit (23) is connected in series, the first loss of pressure signal circuit (20) is provided with a first normally closed contact (21) and a second normally closed contact (22), the second The voltage loss signal circuit (23) is provided with A phase circuit breaker normally open contacts (15), B phase circuit breaker normally open contacts (16) and C phase circuit breaker normally open contacts (17), the first The relay (13) and the second relay (12) control the first normally closed contact (21), and the third relay (5) and the fourth relay (6) control the second normally closed contact (21). Contact (22) for control. 2. A voltage switching relay PT loss signal circuit according to claim 1, characterized in that: said voltage switching relay power supply circuit also includes a first parallel circuit (1) and a second parallel circuit (7), The first bus circuit (9) and the second bus circuit (2) are connected in parallel through the first parallel circuit (1) and the second parallel circuit (7). 3. A voltage switching relay PT voltage loss signal circuit according to claim 2, characterized in that: the end of the first parallel circuit (1) is provided with a first power terminal (8), and the first The end of the bus circuit (9) is provided with a second power terminal (14), the end of the first parallel circuit (1) is connected to the power supply through the first power terminal (8), and the first bus The end of the loop (9) is connected to the power supply through the second power supply terminal (14). 4. A voltage switching relay PT voltage loss signal circuit according to claim 1, characterized in that: a first intermediate terminal (11) is provided in the middle of the first bus circuit (9), and the second bus The middle part of the loop (2) is provided with a second intermediate terminal (4). 5. A voltage switching relay PT loss-of-voltage signal circuit according to claim 1, characterized in that: a first signal circuit terminal (19) is provided at the end of the first loss-of-voltage signal circuit (20), so The end of the second voltage loss signal circuit (23) is provided with a second signal circuit terminal (18), and the PT pressure loss signal circuit passes through the first signal circuit terminal (19) and the second signal circuit terminal (18) Connect with other circuits. 6. A voltage switching relay PT loss-of-voltage signal circuit according to claim 1, characterized in that: the first loss-of-voltage signal circuit (20) and the second loss-of-voltage signal circuit (23) pass through The third intermediate terminals (24) are connected.

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