CN203376430U - Substation secondary control cable shielding current real-time monitoring device - Google Patents

Abstract

The utility model relates to a substation secondary control cable shielding current real-time monitoring device. The structure is that a current transformer is connected to a grounding wire of a cable shielding layer, the output end of the current transformer is connected with a current data acquisition processor, the output end of the current data acquisition processor is connected with a display and a current comparator, and the current comparator is connected with an upper computer of a common measurement and control screen through a communication module. The substation secondary control cable shielding current real-time monitoring device acquires data of shielding current of shielding cables of important lines and equipment intervals in real time, and the data is uploaded to local and a dispatching monitoring system so as to be used for monitoring, thereby ensuring the maintenance personnel to master whether the shielding effect of an in-station grounding system and a secondary cable is normal or not in time. When the shielding current is abnormal, the maintenance personnel are enabled to carry out inspection on the secondary cable loop in time so as to ensure the reliable operation of secondary equipment.

Description

Substation secondary control cable shielding current real-time monitoring device

technical field

The utility model relates to a shielding current monitoring device, in particular to a real-time monitoring device for the shielding current of a substation secondary control cable, which belongs to the technical field of electric power transmission.

Background technique

According to the requirements of the 18 countermeasures of the State Grid, cables with shielding layers should be used for secondary control cables, and the cable shielding layers must be well grounded to ensure reliable operation of secondary equipment. In the actual operation on site, it is not intuitive whether the shielding layer of each secondary cable plays a shielding role and whether there is a shielding current passing through. Secondary maintenance personnel are required. During the inspection period, the shielding can only be judged after using special instruments and meters for measurement. Whether the layer is well grounded, cannot monitor the reliability of the grounding system and cable shielding in the station in time.

Utility model content

Aiming at the problems in the prior art, the utility model provides a real-time monitoring device for the shielding current of the secondary control cable of the substation, which solves the problem that the shielding current cannot be monitored in real time in the prior art.

The technical scheme of the utility model is as follows:

.The current transformer is connected to the ground wire of the cable shielding layer, the output terminal of the current transformer is connected with the current data acquisition processor, the output terminal of the current data acquisition processor is connected with the display and the current comparator, and the current comparator is connected with the public measurement and control through the communication module The upper computer of the screen is connected.

The current transformer is a 12-way mobile clamp current transformer.

The upper computer is connected to the dispatching and monitoring center through a 3G or GPRS wireless communication module. the

The utility model has the following advantages:

The shielding current of the shielded cables of important lines and equipment intervals is collected by installing a multi-channel mobile clamp-type current acquisition device to collect data in real time, after data processing and data comparison, if the data is abnormal, it will be uploaded to the local and dispatching monitoring system through the communication module , alarm and monitoring can enable maintenance personnel to check the secondary cable grounding loop in time to ensure the reliable operation of secondary equipment. The ground potential of the secondary circuit can be monitored to ensure that the transient potential generated by the primary equipment of the substation minimizes the interference to the secondary equipment.

Description of drawings

Fig. 1 is a structural schematic block diagram of the utility model.

Detailed ways

The utility model is described in detail below in conjunction with specific embodiments with reference to the accompanying drawings.

Example

As shown in Figure 1, the 12-way mobile clamp current transformer is connected to the ground wire of the cable shielding layer, the output terminal of the current transformer is connected to the current data acquisition processor, and the output terminal of the current data acquisition processor is connected to the display and current comparison The current comparator is connected to the upper computer of the public measurement and control screen through the network port of the communication module or the 485 port, and the upper computer is connected to the dispatching monitoring center through the 3G or GPRS wireless communication module.

The monitoring method of the utility model is as follows: on the important secondary cable shielding wires in the protective screen, a multi-channel mobile clamp-type current acquisition device is installed, and the current value in the multiple shielding wires is automatically measured at the same time. Set the current comparator's over-limit action and return value, low-limit action and return value according to the regulations and the actual situation on site. When the current in any shielded wire does not meet the set value, the current comparator will send out an alarm message. Through the network port or 485 port, the communication module can transmit the alarm information "abnormal shielding current alarm in XX protection screen" to the public measurement and control screen, and then connect with the monitoring system. The above alarm information is transmitted to the local monitoring background and dispatching monitoring center through the monitoring system, so that the operator can find out whether the cable shielding current is normal and whether the secondary circuit cable and grounding are normal in time.

The utility model uses a multi-channel clamp-type current acquisition device to ensure that the use and dismantling of the device will not affect the grounding operation of the cable shielding layer, realizes movable use, and focuses on monitoring.

The utility model adopts a 12-channel clamp-type current acquisition system. After the current data is collected, one channel is used to display the shielding current value of each cable, and the other channel is input to a current comparator. When the shielding current of each cable is lower or higher than the limit value, the current comparison The module sends out an alarm signal, which is sent to the on-site public measurement and control panel through the communication module, and then sent to the dispatching monitoring alarm by the public measurement and control panel, so that the abnormality can be dealt with in time.

The utility model uses a direct current power supply to prevent the instability of the alternating current power supply system when the system is abnormal, and ensures reliable, stable and continuous measurement data.

Claims (3)

1. substation secondary control cables bucking current real-time monitoring device, it is characterized in that current transformer is connected on the cable shielding layer earthing line, the current transformer output terminal is connected with the current data Acquisition Processor, the output terminal of current data Acquisition Processor connects display and current comparator, and current comparator is connected with the host computer of public observing and controlling screen by communication module.

2. substation secondary control cables bucking current real-time monitoring device according to claim 1, is characterized in that described current transformer is the portable split core type current transformers in 12 tunnels.

3. substation secondary control cables bucking current real-time monitoring device according to claim 1, is characterized in that described host computer connects dispatch center by 3G or GPRS wireless communication module.

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