Insulation performance on-line monitoring system and medium and low voltage ship power system using same

Abstract

The utility model discloses an insulating property on-line monitoring system, comprising a high-resistance resistor module, one end of the high-resistance resistor module is connected with a three-phase line, and the other end of the high-resistance resistor module is connected with a signal injection source; the two ends of the high-resistance resistor are further provided with first voltage detection devices. The high-resistance resistor module comprises at least one resistor R; one end of the actual circuit detection module is connected with the three-phase line, and the other end of the actual circuit detection module is grounded; second voltage detection devices are installed at the two ends of the actual circuit detection module. The actual circuit detection module comprises at least one actual circuit detection unit, the actual circuit detection unit comprises a resistor r and a capacitor C, and the resistor r and the capacitor C are connected in parallel. According to the utility model, whether the system has neutral line output or not is not limited any more, and unbalance of three-phase voltage to the ground is not caused.

Description

Technical Field

[0001] The utility model belongs to the field of intelligent testing in the field of ships, and specifically relates to an online monitoring system for insulation performance and a medium and low voltage ship power system using the system. Background Art

[0002] Currently, medium and low voltage online insulation monitoring devices are mainly used in three-phase four-wire systems, while the electricity consumption on ships is mainly three-phase three-wire, and cannot be directly applied to ships.

[0003] The so-called insulation alarm devices installed on medium and low voltage ships mainly monitor leakage current and have low measurement accuracy.

[0004] Therefore, we need to develop a high-precision online insulation monitoring device that can be used on ships. Utility Model Content

[0005] The utility model aims to solve the problems existing in the prior art and provides an insulation monitoring device capable of directly accessing a three-phase three-wire injection signal with high resistance.

[0006] The utility model provides an online monitoring system for insulation performance, comprising a high-resistance resistor module, one end of the high-resistance resistor module is connected to a three-phase line, and the other end of the high-resistance resistor module is connected to a signal injection source; a first voltage detection device is also installed at both ends of the high-resistance resistor; the high-resistance resistor module includes at least one resistor R; and an actual circuit detection module is also included, one end of the actual circuit detection module is connected to the three-phase line, and the other end of the actual circuit detection module is grounded; a second voltage detection device is installed at both ends of the actual circuit detection module; the actual circuit detection module includes at least one actual circuit detection unit, the actual circuit detection unit includes a resistor r and a capacitor C, and the resistor r and the capacitor C are connected in parallel.

[0007] Preferably, the high-resistance resistor module includes three resistors R connected in parallel;

[0008] Further preferably, the resistance of each resistor R is 20 kΩ.

[0009] Preferably, the actual circuit detection module includes three actual circuit detection units connected in parallel.

[0010] Further preferably, the resistance range of the resistor r in each of the actual circuit detection units is 0 kΩ to 9999 kΩ.

[0011] Further preferably, the capacitance range of the capacitor C in each of the actual circuit detection units is 0 μF to 999 μF.

[0012] Preferably, it further comprises a power circuit, which is connected to the actual circuit detection module and is used to measure whether there is leakage in the circuit.

[0013] The utility model also provides a medium and low voltage ship power system, which applies the above-mentioned insulation performance online monitoring system.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Existing technologies can only detect neutral-line input signal sources, making it impossible to monitor systems without a neutral line. Alternatively, single-phase live-line input signal sources can cause three-phase voltage imbalance relative to ground. This solution perfectly addresses both of these issues, eliminating the need for neutral-line output and preventing three-phase voltage imbalance relative to ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the circuit schematic diagram of the ship's power supply system;

[0017] Figure 2 This is a simplified circuit detection schematic diagram. DETAILED DESCRIPTION

[0018] In order to deepen the understanding of the present invention, the present invention will be described in detail below with reference to the embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0019] Example 1

[0020] See also Figure 1 and Figure 2 This embodiment provides an online insulation performance monitoring system, including a high-resistance resistor module, wherein the high-resistance resistor module includes three resistors R, namely a first resistor R1, a second resistor R2, and a third resistor R3, each of which is connected to one phase of a three-phase line; the other end of the high-resistance resistor module is connected to a signal injection source 1; and a first voltage detection device is further installed at both ends of the high-resistance resistor, namely, a voltage detection device between points A and D;

[0021] It also includes an actual circuit detection module, which includes three actual circuit detection units, each of which is connected to one phase of the three-phase line; the other end of the actual circuit detection module is grounded; a second voltage detection device is installed at both ends of the actual circuit detection module, that is, the voltage between point B and point D; each of the actual circuit detection units includes a resistor r and a capacitor C, and the resistor r and the capacitor C are both connected in parallel.

[0022] The system also includes a power circuit, which is connected to the actual circuit detection module and is used to measure whether there is leakage in the circuit; when leakage occurs, the power circuit issues an alarm.

[0023] In this embodiment, the resistance of each resistor R in the high-resistance resistor module is 20 kΩ.

[0024] In this embodiment, the resistance range of the resistor r in each of the actual circuit detection units is 0 kΩ to 9999 kΩ.

[0025] In this embodiment, the capacitance of the capacitor C in each of the actual circuit detection units ranges from 0 μF to 999 μF.

[0026] When the circuit in this embodiment is working, the signal injection source inputs the signal, the signal passes through the high-resistance resistor module, and then enters the actual circuit detection module. Under normal operating conditions, the resistance and capacitance in the actual circuit detection module are within the normal threshold range, and the values of the first voltage detection device and the second voltage detection device are also within the normal threshold range; when leakage occurs, the actual values of the resistance and capacitance in the actual circuit detection module are no longer within the normal threshold range, and the values of the first voltage detection device and the second voltage detection device are no longer within the normal threshold range. Therefore, when the values of the resistance r, the dynamic capacitance C, the first voltage detection device and the second voltage detection device are abnormal, it can be determined that leakage has occurred, and the power circuit will sound an alarm.

[0027] Example 2

[0028] This embodiment is a medium- and low-voltage ship power system, in which the insulation performance online monitoring system in the first embodiment is applied.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An insulation performance online monitoring system, characterized by: It includes a high-resistance resistor module, one end of which is connected to the three-phase line, and the other end of which is connected to the signal injection source; a first voltage detection device is also installed at both ends of the high-resistance resistor; The high resistance resistor module includes at least one resistor R; It also includes an actual circuit detection module, one end of which is connected to the three-phase line, and the other end of which is grounded; and a second voltage detection device is installed at both ends of the actual circuit detection module; The actual circuit detection module includes at least one actual circuit detection unit. The actual circuit detection unit includes a resistor r and a capacitor C. The resistor r and the capacitor C are connected in parallel.

2. The insulation performance online monitoring system according to claim 1, characterized in that: The high-resistance resistor module includes three resistors R connected in parallel; 3. The insulation performance online monitoring system according to claim 1, characterized in that: The resistance value of each resistor R is 20 kΩ.

4. The insulation performance online monitoring system according to claim 1, characterized in that: The actual circuit detection module includes three actual circuit detection units connected in parallel.

5. The insulation performance online monitoring system according to claim 4, characterized in that: The resistance range of the resistor r in each of the actual circuit detection units is 0 to 9999 kΩ.

6. The insulation performance online monitoring system according to claim 4, characterized in that: The capacitance of the capacitor C in each of the actual circuit detection units ranges from 0 to 999 μF.

7. The insulation performance online monitoring system according to claim 1, characterized in that: It should be: it also includes a power circuit, and the power circuit is connected to the actual circuit detection module.

8. A medium and low voltage ship power system, characterized by: An online insulation performance monitoring system as described in any one of claims 1 to 7 is used.

Images