CN213364928U - Alarm device for monitoring earth fault and accident trip of transformer substation - Google Patents

Abstract

The alarm device for monitoring ground faults and accident tripping of substations of the present invention relates to a power monitoring system, and the purpose is to overcome the inability to guarantee the operation and maintenance of the existing substations when there is no one on duty, interruption of dispatching communication or abnormality, etc. The regulator found the problem of three-phase-to-ground voltage imbalance fault in time, including three voltage transformers, the primary sides of the three voltage transformers were electrically connected to the A-phase line, the B-phase line and the C-phase line, and the three voltage transformers were electrically connected. The secondary side wiring of the device forms an open triangle; it also includes an alarm device; the alarm device includes a single-phase voltage relay and an alarm device; the action signal input end of the single-phase voltage relay is electrically connected to the voltage output end of the open triangle, and the single-phase voltage relay is electrically connected to the voltage output end of the open triangle. The alarm signal output end of the phase voltage relay is electrically connected with the alarm signal input end of the alarm device.

Description

Alarm device for monitoring earth fault and accident trip of transformer substation

Technical Field

The utility model relates to an electric power monitoring system, concretely relates to monitoring three-phase is unbalanced to ground voltage and device that can remote alarm.

Background

With the rapid development of social economy, the construction scale of the power system is also rapidly expanded, the number of the operating lines of the low-current grounding system is gradually increased, and the occurrence rate of line faults is generally higher due to the basic characteristic that the voltage level of the low-current grounding system is lower.

In a small-current grounding system, the phenomenon of unbalance of three-phase voltage to ground is a reaction of power grid abnormity and faults, and is also a common fault, but continuous power supply to users is not influenced, the power grid can be operated in a short time, and if operators can find the faults in time, the operators can correctly judge and limit the development of the faults, and quickly remove the faults, so that the safe operation of the power grid can be ensured; otherwise, the power distribution transformer, the voltage transformer are burnt out, the high-voltage fuse wire is fused, the lightning arrester is exploded, the wire is burnt out, the line is short-circuited, the misoperation is protected, the large-area power failure is caused, and the like. Therefore, when a single-phase earth fault occurs, the fault line must be found in time to be cut off.

At present, when the ground fault and the accident signal are found by depending on the site of a transformer substation and a person on duty for regulation and control, and some transformer substations are unattended, and the dispatching communication is interrupted or abnormal by the transformer substations, and the quantity of information simultaneously sent in a dispatching monitoring system is large, the operation and maintenance cannot be guaranteed, the fault information can not be found by the personnel for regulation and control in time due to the combination of various reasons, the fault cannot be processed in time, and unnecessary harm and loss are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming current partial transformer substation and having unmanned on duty and when the condition such as break off or take place unusually to dispatch communication, unable guarantee fortune dimension and regulation and control personnel in time discover the problem of the unbalanced fault of three-phase to ground voltage, provide an alarm device for monitoring transformer substation ground fault and accident tripping.

The utility model discloses an alarm device for monitoring transformer substation ground fault and accident tripping, including 3 voltage transformer, 3 voltage transformer's primary side respectively with A phase line, B phase line and C phase line electrical connection, and 3 voltage transformer's secondary side wiring constitutes the opening triangle; the device also comprises an alarm device;

the alarm device comprises 1 single-phase voltage relay and 1 alarm;

the action signal input end of the single-phase voltage relay is electrically connected with the voltage output end of the opening triangle, and the alarm signal output end of the single-phase voltage relay is electrically connected with the alarm signal input end of the alarm.

The utility model has the advantages that: this novel easy operation can carry out real time monitoring and discover system's trouble fast to busbar voltage, and convenient and reliable can in time send the trouble and report an emergency and ask for help or increased vigilance the short message when discovering the trouble, utilizes the characteristics of short message "online forever" and "in time reach", ensures that to report an emergency and ask for help or increased vigilance information and does not lose.

Drawings

Fig. 1 is the utility model discloses a warning device for monitoring transformer substation ground fault and accident tripping operation's schematic structure diagram.

Detailed Description

In a first specific embodiment, the alarm device for monitoring the ground fault and the accidental trip of the transformer substation in the first embodiment comprises 3 voltage transformers, wherein primary sides of the 3 voltage transformers are respectively and electrically connected with an a phase line, a B phase line and a C phase line, and secondary side wirings of the 3 voltage transformers form an open triangle; the device also comprises an alarm device;

the alarm device comprises 1 single- phase voltage relay 3 and 1 alarm 4;

the action signal input end of the single-phase voltage relay 3 is electrically connected with the voltage output end of the opening triangle, and the alarm signal output end of the single-phase voltage relay 3 is electrically connected with the alarm signal input end of the alarm 4.

Wherein, also include the monitoring device;

the monitoring device comprises 3 bus alternating- current voltmeters 1 and 1 open-delta alternating-current voltmeter 2;

the voltage input ends of the 3 bus alternating-current voltmeters 1 are respectively and electrically connected with the sampling voltage output ends of the 3 voltage transformers, and the voltages of the phase line A, the phase line B and the phase line C are respectively monitored;

the voltage input end of the open triangle alternating current voltmeter 2 is electrically connected with the voltage output end of the open triangle, and the voltage of the open triangle is monitored.

Specifically, this device comprises collection, logic judgement, the report to the police triplex, and wherein collection part (monitoring devices) includes exchanging voltmeter (0 ~ 150V)4 pieces, is respectively: 3 bus ac voltmeters 1 and 1 open-delta ac voltmeters 2. Respectively collects the bus A, B, C and the open-delta voltage,

the logic judgment part of the alarm device is a single-phase voltage relay 1 block, the open-delta voltage is monitored, the action fixed value is preset, and when the single-phase voltage relay reaches the set value and acts, the auxiliary contact is connected, and the alarm 4 is started.

The alarm part of the alarm device is an alarm 4, and after the alarm device is started, a short message alarm (1-10 numbers can be set and are determined according to the specific model of the alarm 4) is sent to a preset mobile phone number according to preset alarm content.

Wherein, the single-phase voltage relay 3 is a time delay relay.

Wherein, the alarm 4 is a short message remote alarm controller, and the action contact of the single-phase voltage relay 3 is electrically connected with the opening contact of the alarm 4. The alarm 4 is preferably an FY-GSMW type short message alarm remote controller (comprising an antenna).

The action constant value of the single-phase voltage relay 3 is 10V, and the action delay is 0 s.

Specifically, there are two ways to implement the alarm function in conjunction with fig. 1, namely, a mobile portable device installed for a short time, and a fixed device installed in a certain substation.

The first method is as follows: the device comprises 3 bus alternating- current voltmeters 1, 1 open-delta alternating-current voltmeter 2, a single-phase voltage relay 3 and an alarm 4.

The action value of the single-phase voltage relay 3 is set to be 10V, the action delay is 0s, the action node is connected to the opening contact of the alarm 4 and is arranged in the protective shell, and the three-phase voltage, the opening triangular voltage, the accident total contact and the power connection of the short message alarm remote controller are reserved.

When a certain transformer substation needs, only three-phase voltage sampling and accident total signals need to be connected into the device, and a 220V alternating current uninterrupted power supply is connected. The method is suitable for power transmission and data network interruption scheduling or temporary monitoring.

Before the alarm 4 is used, a mobile phone card needs to be inserted under the condition that the controller is powered off, and the antenna is connected and screwed down. When the power supply is switched on, the yellow signal indicator lamp on the controller begins to flash, the flash lamp is connected with the mobile phone network once every second, and the flash lamp is connected with the mobile phone network once every 3 seconds. And waiting for about 20 seconds, and constantly lighting a red indicator lamp.

The authorization can be performed only when the red indicator lamp is normally on within 40 minutes of starting, and the red indicator lamp is turned off after 40 minutes of starting, and the authorization cannot be performed, if the authorization is required, the power is turned off, and the authorization is performed within 40 minutes of starting.

For example, set 136XXXXXXX as authorization one

The mobile phone sends a short message to the controller: authorization-136 XXXXXXX # query

The controller returns a short message to the mobile phone: authorization one 136XXXXXXXX

When a small current system normally operates, the single-phase voltage of the voltage transformer is generally 57.7V, the open-delta voltage is very small and generally cannot exceed 10V. And observing whether the 3 bus alternating-current voltmeters 1 resonate or not.

When a ground fault occurs, the ground-to-ground voltage is lowered, the normal ground-to-ground voltage is raised to the line voltage, and the open delta voltage is raised. When the single-phase voltage relay 3 reaches the action setting, the action contact is connected, the alarm 4 is started, and a short message is sent to the preset mobile phone number for alarming. Similarly, when the accident trip occurs, the short message can be received for alarming.

The second method comprises the following steps: the stationary device comprises only a single-phase voltage relay 3 and an alarm 4.

The single-phase voltage relay 3 and the alarm 4 are directly installed on the inner terminal row of the protection screen or the switch cabinet, the action node of the single-phase voltage relay 3 is connected to the switch-in contact of the alarm 4, and the antenna is installed outside the protection screen or the switch cabinet to avoid signal shielding.

The use and operation mode is the same as the first mode, only the voltmeter is lacked to observe whether the system has the resonance function, and the system is suitable for the transformer substation which is unattended or is not connected with a dispatching data network.

Meanwhile, the alarm 4 also has a standby access point and can be used for remotely controlling other devices, and if the wiring is needed at a corresponding position and alarm information is preset, the remote short message alarm function can be completed.

The bus AC voltmeter 1 and the open-delta AC voltmeter 2 are BE-96 type voltmeters.

Claims (6)

1. The alarm device for monitoring the ground fault and the accident trip of the transformer substation comprises 3 voltage transformers, wherein primary sides of the 3 voltage transformers are respectively and electrically connected with an A phase line, a B phase line and a C phase line, and secondary side wiring of the 3 voltage transformers forms an open triangle; it is characterized by also comprising an alarm device;

the alarm device comprises 1 single-phase voltage relay (3) and 1 alarm (4);

the action signal input end of the single-phase voltage relay (3) is electrically connected with the voltage output end of the opening triangle, and the alarm signal output end of the single-phase voltage relay (3) is electrically connected with the alarm signal input end of the alarm (4).

2. The alarm device for monitoring substation ground fault and accident tripping of claim 1, further comprising a monitoring device;

the monitoring device comprises 3 bus alternating-current voltmeters (1) and 1 open-delta alternating-current voltmeter (2);

the voltage input ends of the 3 bus alternating-current voltmeters (1) are respectively and electrically connected with the sampling voltage output ends of the 3 voltage transformers, and the voltages of the phase line A, the phase line B and the phase line C are respectively monitored;

the voltage input end of the open triangle alternating current voltmeter (2) is electrically connected with the voltage output end of the open triangle, and the voltage of the open triangle is monitored.

3. The alarm device for monitoring substation ground faults and accidental trips according to claim 1, characterized in that the single-phase voltage relay (3) is a time delay relay.

4. The alarm device for monitoring the ground fault and the accidental trip of the transformer substation according to claim 3, characterized in that the alarm (4) is a short message remote alarm controller, and the action contact of the single-phase voltage relay (3) is electrically connected with the open-in contact of the alarm (4).

5. The alarm device for monitoring substation ground fault and accident tripping according to claim 1, 2, 3 or 4, characterized in that the action constant value of the single-phase voltage relay (3) is 10V and the action delay is 0 s.

6. The alarm device for monitoring the ground fault and the accident trip of the substation according to claim 1, characterized in that the bus ac voltmeter (1) and the open delta ac voltmeter (2) are both BE-96 type voltmeter.

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