REMOTELY MONITORED AND CONTROLLED TRANSFORMER

• US 3,855,503 A
• Filed: 09/26/1973
• Issued: 12/17/1974
• Est. Priority Date: 09/26/1973
• Status: Expired due to Term

• Current Assignee: ABB Power T&D Co Inc (ABB Limited)
• Original Assignee: Donald J. Ristuccia
• Inventors: Ristuccia, Donald J.
• Primary Examiner(s): Harris, G.
• Application Number:
  US05/401,097
• Time in Patent Office: 447 Days
• Field of Search: 317/14H,14R,14J,14G,27R,4R 340/228R
• US Class Current: 361/37
• CPC Class Codes: H02H 1/0061 concerning transmission of signals transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26
• CPC Class Codes: H02H 7/04 for transformers

Abstract

A power transformer adapted for remote monitoring and controlling, and system of providing same. The transformer contains a temperature sensor, a pressure sensor, and a deenergizing switch. Electrical signals from the sensors are transferred to a remote load management center which compares the signals to predetermined standards and originates a switching signal when a standard is exceeded. The switching signal opens the switch to de-energize the transformer. The load management center may utilize standards which are fixed or which are variable with other conditions in the power system.

Claims

1. Electrical apparatus comprising:

an enclosure;

a core and coil assembly disposed within said enclosure;

temperature sensing means which electrically responds to the temperature of said core and coil assembly to provide a temperature signal which is detectable outside said enclosure;

pressure sensing means which electrically responds to the pressure within said enclosure to provide a pressure signal which is detectable outside said enclosure; and

switching means for disconnecting the coil from an energizing voltage, said switching means being responsive to an electrical switching signal which is originated from outside said enclosure.

2. The electrical apparatus of claim 1 including:

transfer means for conveying signals, said transfer means having first and second ends;

coupling means for connecting the first end of said transfer means to the temperature, pressure, and switching means; and

a load management center which is connected to the second end of said transfer means, said load management center originating the switching signal which disconnects the coil from the energizing voltage, said switching signal being originated in response to predetermined conditions of the temperature and pressure signals.

3. The electrical apparatus of claim 2 wherein a switching signal is originated by the load management center when the temperature signal corresponds to a coil assembly temperature which exceeds a first predetermined temperature, said first predetermined temperature being greater than the coil assembly temperature during normal full load operation.

4. The electrical apparatus of claim 2 wherein a switching signal is originated by the load management center when the pressure signal corresponds to an enclosure pressure which exceeds a first predetermined pressure, said first predetermined pressure being greater than the enclosure pressure during moderately overloaded operation.

5. The electrical apparatus of claim 2 wherein a switching signal is originated by the load management center when the temperature signal corresponds to a coil assemblY temperature which exceeds a first predetermined temperature, and a switching signal is originated by the load management center when the pressure signal corresponds to an enclosure pressure which exceeds a first predetermined pressure, said first predetermined pressure being greater than the pressure produced, during constant load conditions, when the first predetermined temperature is produced.

6. The electrical apparatus of claim 1 wherein the temperature sensing means comprises a thermocouple located substantially within the structure of the core and coil assembly.

7. The electrical apparatus of claim 1 wherein the pressure sensing means comprises resistance means which changes electrical resistance in response to a change in the sensed pressure.

8. The electrical apparatus of claim 1 wherein the switching means comprises a vacuum switch located within the enclosure.

9. The electrical apparatus of claim 1 wherein a current operated protective device is connected in series circuit relationship with the coil and the energizing voltage.

10. The electrical apparatus of claim 2 wherein the load management center comprises:

means for comparing the temperature signal with a first reference signal;

means for comparing the pressure signal with a second reference signal; and

means for originating a switching signal when either comparing means acquires a predetermined output signal in response to the comparisons.